This is a children’s picture book I read in the 70’s…The grandpa (who has a mustache) is reminiscing with his grandson about his childhood. When the illustrations show the grandpa as a child, he still has a mustache.
This is pretty much all I can remember.
These are the Grandpa, Mary Ann, and Louie books by James Stevenson. A lot of people remember the book Could Be Worse.
https://www.goodreads.com/book/show/976328.Could_Be_Worse_
This is it! Thank you so much, I’ve been thinking about this for years.
You’re welcome!