This book would be from mid-late 1950s. Color illustrations throughout, done in a painterly style. A girl (with pigtails?) named (Belinda?) gets some money somehow. She sneaks off to the penny candy store to spend it and doesn’t want any of the other children to see her. In the old-fashioned candy store, they wrap her purchases up in a brown paper cone. As she runs home to avoid the others, the candies fall out one by one. The neighborhood children pick them up and return them to her. She learns about selfishness and makes new friends. I think she is wearing an old-fashioned coat with muff. I tried to find this book when my daughter was little, to no avail.

The title is something like, “I’ll Be The Mommy and You’ll be The Little Girl”or vice versa.  It also may include “I’ll be the Daddy, you be the Little Boy,” (or vice versa as well.)  The book is from the early 1980’s, I think, suitable for early primary children.  It is two stories in one book  The first part is about a mommy and little girl going for an outing and they change roles briefly.  If they book is turned over and similar story involves a daddy and a little boy doing the same thing.  In the middle of the book is a two page illustration of the parents and the boy and girl meeting up in the home…just adorable.  It is nicely illustrated and while I don’t see it listed on any Sesame Street lists, the illustrations of the characters remind me of that company’s type of drawing.