I remember one song on the Street (on the steps of 123) with Gordon and Olivia (about 1976 or 1977) called "Little sister is a big girl now". From what I recall, Gordon was a little disappointed that Olivia didn't let him do something for her that he had before. So he started to sing, 'Who taught you how to tie your shoe?" She said, "You did." And then he added something else, "And who taught you..." She said, "You did. But you were 5 and I was 2. Little sister is a big girl now." Then on his subsequent examples she replied, "But you were 6 and I was 3" and "But you were 7 and I was 4." Then after the song concluded Gordon's feelings weren't hurt anymore as he realized that she is indeed entirely independent as he is, since she is a grown up too. I think he smiled a little and said something like, "You really are a big girl, aren't you?"