Ancestry makes it difficult to determine these things by lopping off matching bits that their computer finds too common to be useful. To find the full amount, you have to click through a few DNA results links, where they will then tell you the full amount of matching DNA, how many segments, and the size of the largest segment. They also don’t list anyone in the common matches who has less than 20cM of matching DNA, so if a relative is like a 19.9 cM in-common match, it will look like they are not an in-common match at all. Very frustrating!
Can't wait. Just found something similar with my daughter not only sharing more with one but also having a "unique" (so far) connection to another ancestor that no one else from her great aunt to any of the other 6 kits older than her generation has. Made the mistake of not paying attention to the other "youngsters" and missed other connections until recently🙄.
Thank you for a fascinating video, one that is quite topical for me. My father, son, and I are all tested on Ancestry, and I find that my son has a higher cM count with a significant number of matches than I do. That is 53 matches out of a sample of 215 I have compared. I've discounted the chance of common ancestors on his mother's side, as she came to Australia from Germany, and her heritage is predominantly German, Romanian, and Southern Russian. I have some German going back to my Great grandfather, but we have found no DNA matches linking his family to my wife's. Scatter plots of my son's cM as a percentage of mine with these matches make for some unexpected behaviour, with far more matches in the 80-130% range than I expected. Plotting the differences rather than percentages shows differences of -7 to 30 cm in matches I have in the 20-50cM range, with similar but less linear correlation plotted against my son's shared cM. I've tried to describe the significance and range of the number of matches where my son's cM count exceeds mine for common matches. Do you have any suggestions as to how I should approach researching this?
Thank you for another interesting video. I have a handful of "share toy" cousins. I share with them one segment with my father and another with my mother, but my mother and father do not match each other at all (thank goodness!). Most of them, I have only figured out one ancestral path that I share with them, but at least I can break down which segment goes with which parent so that I can work with the information given. Have a blessed day.
I share more DNA with some matches with my dad. This girl says I match her on both sides of her family. Another one a distance match. I was trying to determine what side of the family she's on. She says she has less DNA with my dad than me which surprised me. Only logic thing I can think maybe she also match my mom but it's distance ancestry don't bother having her match my mom.
I know its impossible to receive more DNA. from your parent or grandparent with respect to a partiicular line, but you see it so much it's easy to doubt yourself.. It's nice to see broken down into reasons anx numbers Kudos Andy!
Hi Andy! What you show in this video can best be observed on archaic 8-1000 year old samples. For example, a sample of a Swedish Viking with 50 segments and 16 chromosomes matches both my father and mother. Since a person can have hundreds of thousands of ancestors within 30 generations, these segments can come from anyone and anywhere.
I've just rewatched this video having recently received my test results from AncestryDNA having tested my grandpa 3 years ago. The majority of results are fine however I am finding in a number of cases I share more DNA with matches that we both (only a cM or two), but even more puzzlingly some matches we both have, looking at our results separately, my grandpa doesn't appear on my shared matches for those matches, despite 20-30 other matches we have in common appearing in the shared matches. I'm now wondering if he is dropped off the shared match list because he has been identified as a known relation and he shouldn't have less DNA shared with a match than I do (it surely can't be that because they can't discount multiple lines even though I with a very high probability, not impossible, nothing in genealogy is, can). The only other explanation I have is that the AncestryDNA test is slightly different now and tests more SNPs or in slightly different positions than 3 years ago.
I have this on a number of people where I have more cMs to matches than my mother. Match A is a 38 cM match to me and only 28 cM to my mom. Theoretically I should have only 0 to 18 cM's in common with this person. Not just one person, but 5 of the people that are closely related to Match A, show the same anomaly of me having more cMs than my mom. Unfortunately dad has been gone nearly 30 years since his heart attack. And I also have another 5 people where I share more cMs than my mother, but these 5 are not related to each other very closely. All in all I have about a dozen people where this anomaly shows up and I can only think that my parents either share a 5th-8th cousins or themselves are 5th-8th cousins. If it was just the one set of 5 matches related to each other I could believe they are 5th cousin to my parents separately, but the total number of these matches and their lack of relatedness to each other makes me think that my parents are semi distant cousins.
I've only just got my test results and the same occurs a number of times for me as well, however for me it's between me and my grandpa. I tested my grandpa 3 years ago when he'd just turned 100, and have been analysing his results in quite detail so much I recognise a huge number of the names (especially those over 20cM). For some matches, where all 30+ shared matches are also matches of his, he doesn't appear at top of shared matches as I would expect. It is extremely unlikely for the to be another line linking me to the match, he moved away from where he was born and his ancestors were from and other grandparents aren't from that area so I can only see that I would match through him, it's a little bizzare. I'm thinking this is more a website, back end calculation and presentation issue, whereas the having sightly more DNA with a match just down to the supply and/or processing of the DNA having margins of error.
On ancestry my grandma has shared matches to children & grandchildren of Jane Doe but not to Jane Doe herself. However, Jane Doe and my grandma have shared matches that are in the Jane Doe line. Jane Doe's gggg gf is my grandma's ggg gf. When the tests are uploaded to My Heritage Jane Doe, her children, and her grandchildren match my grandma but the percentages are lower for Jane Doe than her offspring. Is this a case where my grandma and the offspring of Jane Doe are related on both sides? (The husband of Jane Doe has not been tested)
😅Happens All the time between my daughter and I with the same match. She may have one or 2 more cM sometimes a bit more than I do with same DNA match. DNA is like a game of pick up sticks, you know throw up in the air and anyone's guess where they will land?
I see this quite often with my parents. There are several areas in common between them and several common matches between them but no dna shared between them but…. What if they received different dna from the same distant ancestor ? One particular dna match my father has that I have yet to tie up is actually a relative of my mother but dna distribution down the lines meant they didn’t get to retain any common dna from their common ancestors.
@@amiwhite5514 - Not close enough to show in DNA. But there are too many connections to say they can't be at all. But with Essex, Wiltshire and London ancestry, the connection is likely somewhere in those areas in the distant past.
Whilst this is interesting and an explanation of what might be happening I was hoping that this would explain why some of my grandpa's matches match with his half nephew's children but not their father (his half nephew). All of this is on Ancestry so unless it is different chips or algorithms being used for the separate tests I can't explain this. Unfortunately with most matches they aren't all on GEDmatch so I can't analyse exact locations of matching segments like you did. Any thoughts? (and it can't be DNA coming from the mother as she isn't from anywhere near the same location as the father, or my grandpa)
I have a couple of theories, but I need more info from you to narrow them down. 1) How much DNA is different? 2) How do you know? (Ancestry does some tricky things in their reporting). 3) Can the half nephew’s mother AND paternal grandmother (your grandfather’s step-mom) be ruled out as not possibly sharing any DNA with your grandfather? I ask this because I am seeing significant matches in my own profile where the only common relative is way way back in colonial New England.
@@margaretford1011 Ok, a couple of points, maybe I didn't explain this will enough (or maybe just omitted the detail). My grandfather shared a mother with this half nephew's mother (the mother of the half nephew and my grandfather were half brother and sister, confusing I know), different fathers (her first husband died and she remarried). Secondly I can't definitively file out there being no family connection through the half nephew's father's mother or grandmother, but it is very unlikely, plus I have traced back far enough to think this isn't at all likely, verging on impossible (add to this the fact that this was happening in Northern Ireland and my grandfather's father was Protestant and his mother from a Catholic family (her first husband being Catholic) making it even more unlikely (though nothing is ever impossible). For the children of the half nephew to have shared DNA and their father not have this, it would have to come from their mother and she wasn't from Northern Ireland, they had all left by then so the chances are even smaller (actually I think this is what I think you are actually making before, I will leave the first paragraph for context). I completely agree with your comments about Ancestry and their reporting, but this to me is odd. I've only spotted this when doing some clustering and exporting some of the shared matches of matches to a spreadsheet for clustering purposes. The amount of DNA shared with this half nephew, who my grandpa knew in real life (sent Xmas cards, spoke on the phone to occasionally etc.) so he would probably know if he had married someone else from the locality, I'm pretty sure she is English. So, I've put this down to just DNA tests not being perfect and misreads happen. I don't think these shared matches that don't match the father (half nephew) are at all big, maybe in the 20cM-30cM range so a small error analyzing the test I think it's what happened here, so to me it isn't a biggie, just a curiosity that I've seen occur a handful of times and wondered if this video might offer some explanation.
@@mattpotter8725 Matt, in Ancestry, they do not list everyone who shares a match. They only list people who have 20cM or more in common. For example, if someone shares 35cM with me, if I look up shared matches under her name, I will not see her son’s name who only shares 19cM with me. But if I look up shared matches under HIS name, I WILL see his mother. Might that Ancestry quirk be playing a role in your confusing data? 20 - 30 cM is not likely to be a spurious finding. Secondly, Northern Ireland has a whole lot of endogamy. And they brought those genes to the US with the Scots-Irish in colonial days. I have Catholic ancestors from Antrim who came to the US (north) in 1849. But I have hundreds of so-called matches with families from the South whose families all date back to those Scots-Irish. We’re talking more than ten generations that those genes have been hanging around! They aren’t huge matches, but high enough to be real. So, perhaps that might be a factor at play as well. Puzzles are fun, lol..
@@margaretford1011 Thanks the your comment, I know it was a while ago. I've just rewatched this video because I've just been tested with AncestryDNA and there are some of my matches that I recognise from my grandpa's results, they are well over 20cM on both results (mine and his), and he doesn't appear on my shared matches for them. I can't match with them any other way, as I said before my grandpa is from Northern Ireland originally, the rest of my family is from England (I have some Irish from my paternal side but it's a lot further back and very far from where my grandpa was from, not impossible but very unlikely), and the shared matches I have for these matches, sometimes 30+, all are matches for both me and my grandpa. If they were near the 20cM boundary I might just about agree this might be the reason, a small analysis discrepancy, but they aren't, and he should share more DNA with them because he's 2 generations closer to them than me (not always the case but likely in most cases). I just thought I'd add this in case anyone else watches this video and has seen this in some of their matches through a parent or grandparent they also manage the test for.
@@mattpotter8725 Hello again! I wonder if Ancestry reports as a shared match people who only match on chromosomes that are different from the one(s) the referent match have in common. Given that your grandfather and his half-sister got a different mix of DNA from their shared parent, might this possible quirk of Ancestry account for the anomaly you are seeing?
🤔 Why a DNA Match Doesn't Match Any Other Relatives? 👉🏼ruclips.net/video/UkDtca20dUs/видео.html
Ancestry makes it difficult to determine these things by lopping off matching bits that their computer finds too common to be useful. To find the full amount, you have to click through a few DNA results links, where they will then tell you the full amount of matching DNA, how many segments, and the size of the largest segment. They also don’t list anyone in the common matches who has less than 20cM of matching DNA, so if a relative is like a 19.9 cM in-common match, it will look like they are not an in-common match at all. Very frustrating!
Can't wait. Just found something similar with my daughter not only sharing more with one but also having a "unique" (so far) connection to another ancestor that no one else from her great aunt to any of the other 6 kits older than her generation has. Made the mistake of not paying attention to the other "youngsters" and missed other connections until recently🙄.
On MyHeritage I match with people that match with neither of my parents.
I really don't get that at all.
Thank you for a fascinating video, one that is quite topical for me. My father, son, and I are all tested on Ancestry, and I find that my son has a higher cM count with a significant number of matches than I do. That is 53 matches out of a sample of 215 I have compared.
I've discounted the chance of common ancestors on his mother's side, as she came to Australia from Germany, and her heritage is predominantly German, Romanian, and Southern Russian. I have some German going back to my Great grandfather, but we have found no DNA matches linking his family to my wife's.
Scatter plots of my son's cM as a percentage of mine with these matches make for some unexpected behaviour, with far more matches in the 80-130% range than I expected. Plotting the differences rather than percentages shows differences of -7 to 30 cm in matches I have in the 20-50cM range, with similar but less linear correlation plotted against my son's shared cM.
I've tried to describe the significance and range of the number of matches where my son's cM count exceeds mine for common matches. Do you have any suggestions as to how I should approach researching this?
Thank you for another interesting video. I have a handful of "share toy" cousins. I share with them one segment with my father and another with my mother, but my mother and father do not match each other at all (thank goodness!). Most of them, I have only figured out one ancestral path that I share with them, but at least I can break down which segment goes with which parent so that I can work with the information given.
Have a blessed day.
I share more DNA with some matches with my dad. This girl says I match her on both sides of her family. Another one a distance match. I was trying to determine what side of the family she's on. She says she has less DNA with my dad than me which surprised me. Only logic thing I can think maybe she also match my mom but it's distance ancestry don't bother having her match my mom.
I know its impossible to receive more DNA. from your parent or grandparent with respect to a partiicular line, but you see it so much it's easy to doubt yourself.. It's nice to see broken down into reasons anx numbers
Kudos Andy!
Glad you appreciate my explanations.
Hi Andy! What you show in this video can best be observed on archaic 8-1000 year old samples. For example, a sample of a Swedish Viking with 50 segments and 16 chromosomes matches both my father and mother. Since a person can have hundreds of thousands of ancestors within 30 generations, these segments can come from anyone and anywhere.
The segments on archaic samples that match are almost always extremely small (less than 3 cm) and have a very low SNP count.
That happens often with my sons who tested, they share more with a match than I do, of course, they share less, which would be expected
I've just rewatched this video having recently received my test results from AncestryDNA having tested my grandpa 3 years ago. The majority of results are fine however I am finding in a number of cases I share more DNA with matches that we both (only a cM or two), but even more puzzlingly some matches we both have, looking at our results separately, my grandpa doesn't appear on my shared matches for those matches, despite 20-30 other matches we have in common appearing in the shared matches.
I'm now wondering if he is dropped off the shared match list because he has been identified as a known relation and he shouldn't have less DNA shared with a match than I do (it surely can't be that because they can't discount multiple lines even though I with a very high probability, not impossible, nothing in genealogy is, can). The only other explanation I have is that the AncestryDNA test is slightly different now and tests more SNPs or in slightly different positions than 3 years ago.
The shared match list on Ancestry only goes down to 20 cM.
I have this on a number of people where I have more cMs to matches than my mother. Match A is a 38 cM match to me and only 28 cM to my mom. Theoretically I should have only 0 to 18 cM's in common with this person. Not just one person, but 5 of the people that are closely related to Match A, show the same anomaly of me having more cMs than my mom. Unfortunately dad has been gone nearly 30 years since his heart attack.
And I also have another 5 people where I share more cMs than my mother, but these 5 are not related to each other very closely. All in all I have about a dozen people where this anomaly shows up and I can only think that my parents either share a 5th-8th cousins or themselves are 5th-8th cousins. If it was just the one set of 5 matches related to each other I could believe they are 5th cousin to my parents separately, but the total number of these matches and their lack of relatedness to each other makes me think that my parents are semi distant cousins.
I find that quite often, I think you're right that they are probably just related to you through both parents in different ways.
I've only just got my test results and the same occurs a number of times for me as well, however for me it's between me and my grandpa. I tested my grandpa 3 years ago when he'd just turned 100, and have been analysing his results in quite detail so much I recognise a huge number of the names (especially those over 20cM). For some matches, where all 30+ shared matches are also matches of his, he doesn't appear at top of shared matches as I would expect. It is extremely unlikely for the to be another line linking me to the match, he moved away from where he was born and his ancestors were from and other grandparents aren't from that area so I can only see that I would match through him, it's a little bizzare. I'm thinking this is more a website, back end calculation and presentation issue, whereas the having sightly more DNA with a match just down to the supply and/or processing of the DNA having margins of error.
On ancestry my grandma has shared matches to children & grandchildren of Jane Doe but not to Jane Doe herself. However, Jane Doe and my grandma have shared matches that are in the Jane Doe line. Jane Doe's gggg gf is my grandma's ggg gf. When the tests are uploaded to My Heritage Jane Doe, her children, and her grandchildren match my grandma but the percentages are lower for Jane Doe than her offspring. Is this a case where my grandma and the offspring of Jane Doe are related on both sides? (The husband of Jane Doe has not been tested)
😅Happens All the time between my daughter and I with the same match. She may have one or 2 more cM sometimes a bit more than I do with same DNA match. DNA is like a game of pick up sticks, you know throw up in the air and anyone's guess where they will land?
I see this quite often with my parents. There are several areas in common between them and several common matches between them but no dna shared between them but…. What if they received different dna from the same distant ancestor ? One particular dna match my father has that I have yet to tie up is actually a relative of my mother but dna distribution down the lines meant they didn’t get to retain any common dna from their common ancestors.
So your parents are related?
@@amiwhite5514 - Not close enough to show in DNA. But there are too many connections to say they can't be at all. But with Essex, Wiltshire and London ancestry, the connection is likely somewhere in those areas in the distant past.
Where do you get the info about base pairs? Does Ancestry have that?
Yes but it is hidden and not part of any of their reports they give you. GEDmatch provides you the full details.
I share more cm than my dad to a 4th cousin who is 82 years old
Hello sir, I'm full blood Chinese, why on my DNA match results show more Koreans than Chinese on myheritage. Thank you.
Probably because their reference population of Chinese is small (Chinese is also a large diverse population in and of itself).
@@FamilyHistoryFanatics I agree, thank you sir
my daughter matches pair half siblings first one 181 cm and the other 54 cm how can that be ?
Because inheritance is random. I have seen lots of examples like what you explain. I'll make a video on that.
Whilst this is interesting and an explanation of what might be happening I was hoping that this would explain why some of my grandpa's matches match with his half nephew's children but not their father (his half nephew). All of this is on Ancestry so unless it is different chips or algorithms being used for the separate tests I can't explain this. Unfortunately with most matches they aren't all on GEDmatch so I can't analyse exact locations of matching segments like you did. Any thoughts? (and it can't be DNA coming from the mother as she isn't from anywhere near the same location as the father, or my grandpa)
I have a couple of theories, but I need more info from you to narrow them down. 1) How much DNA is different? 2) How do you know? (Ancestry does some tricky things in their reporting). 3) Can the half nephew’s mother AND paternal grandmother (your grandfather’s step-mom) be ruled out as not possibly sharing any DNA with your grandfather? I ask this because I am seeing significant matches in my own profile where the only common relative is way way back in colonial New England.
@@margaretford1011 Ok, a couple of points, maybe I didn't explain this will enough (or maybe just omitted the detail). My grandfather shared a mother with this half nephew's mother (the mother of the half nephew and my grandfather were half brother and sister, confusing I know), different fathers (her first husband died and she remarried).
Secondly I can't definitively file out there being no family connection through the half nephew's father's mother or grandmother, but it is very unlikely, plus I have traced back far enough to think this isn't at all likely, verging on impossible (add to this the fact that this was happening in Northern Ireland and my grandfather's father was Protestant and his mother from a Catholic family (her first husband being Catholic) making it even more unlikely (though nothing is ever impossible).
For the children of the half nephew to have shared DNA and their father not have this, it would have to come from their mother and she wasn't from Northern Ireland, they had all left by then so the chances are even smaller (actually I think this is what I think you are actually making before, I will leave the first paragraph for context).
I completely agree with your comments about Ancestry and their reporting, but this to me is odd. I've only spotted this when doing some clustering and exporting some of the shared matches of matches to a spreadsheet for clustering purposes. The amount of DNA shared with this half nephew, who my grandpa knew in real life (sent Xmas cards, spoke on the phone to occasionally etc.) so he would probably know if he had married someone else from the locality, I'm pretty sure she is English.
So, I've put this down to just DNA tests not being perfect and misreads happen. I don't think these shared matches that don't match the father (half nephew) are at all big, maybe in the 20cM-30cM range so a small error analyzing the test I think it's what happened here, so to me it isn't a biggie, just a curiosity that I've seen occur a handful of times and wondered if this video might offer some explanation.
@@mattpotter8725 Matt, in Ancestry, they do not list everyone who shares a match. They only list people who have 20cM or more in common. For example, if someone shares 35cM with me, if I look up shared matches under her name, I will not see her son’s name who only shares 19cM with me. But if I look up shared matches under HIS name, I WILL see his mother. Might that Ancestry quirk be playing a role in your confusing data? 20 - 30 cM is not likely to be a spurious finding.
Secondly, Northern Ireland has a whole lot of endogamy. And they brought those genes to the US with the Scots-Irish in colonial days. I have Catholic ancestors from Antrim who came to the US (north) in 1849. But I have hundreds of so-called matches with families from the South whose families all date back to those Scots-Irish. We’re talking more than ten generations that those genes have been hanging around! They aren’t huge matches, but high enough to be real. So, perhaps that might be a factor at play as well.
Puzzles are fun, lol..
@@margaretford1011 Thanks the your comment, I know it was a while ago. I've just rewatched this video because I've just been tested with AncestryDNA and there are some of my matches that I recognise from my grandpa's results, they are well over 20cM on both results (mine and his), and he doesn't appear on my shared matches for them. I can't match with them any other way, as I said before my grandpa is from Northern Ireland originally, the rest of my family is from England (I have some Irish from my paternal side but it's a lot further back and very far from where my grandpa was from, not impossible but very unlikely), and the shared matches I have for these matches, sometimes 30+, all are matches for both me and my grandpa. If they were near the 20cM boundary I might just about agree this might be the reason, a small analysis discrepancy, but they aren't, and he should share more DNA with them because he's 2 generations closer to them than me (not always the case but likely in most cases). I just thought I'd add this in case anyone else watches this video and has seen this in some of their matches through a parent or grandparent they also manage the test for.
@@mattpotter8725 Hello again! I wonder if Ancestry reports as a shared match people who only match on chromosomes that are different from the one(s) the referent match have in common. Given that your grandfather and his half-sister got a different mix of DNA from their shared parent, might this possible quirk of Ancestry account for the anomaly you are seeing?
She was cheating with his brother or uncle! **My first thought before watching.
While it could be the answer, we always want to back up those possibilities by doing the analysis.