Sandy and Sylvia Duncan - Southwestern Bell Commercial

Sandy Duncan and her mother Sylvia Duncan in a regional commercial for Southwestern Bell. Sandy's dad, Mancil had some lines I think, but they had to be cut because he couldn't get through them without choking up! So, he just gets a quick close-up.
It was so rare for Sylvia to get in front of the camera - She did not like it! So, this is a treasure to have. I wish the original old Betamax tape wasn't so damaged. My guess is 1980 for the date on this since Sandy was on Broadway doing "Peter Pan".