My grandparents all divorced before I was born, so growing up I had four separate grandparents, never sets of grandparents. When I was older, I figured out the answer... marriage hadn't been invented yet back then. I knew that people made do before things like cars and televisions were invented, so it only made SENSE to me that my grandparents had kids before marriage had been invented! And why did OTHER kids have married grandparents? They'd all gotten married after it was invented... you know, they just sort of jumped on the bandwagon.
A childhood belief about marriage

others believed things like this
- I used to think my grandparents were born in prehistoric times.Anon
- I used to believe that My grandparents didn't have any other name except grandma and grandpa.— Emelia
- I used to believe that my grandparents' world was in black and white.— Sara Serés
- When I was little i thought grandparents had to be hundreds of meters tall... Anon
- I used to believe my nieghboor jose invented the language spanish and he got rich and bought cars— Thomas
- I used to believe that until gravity was invented, people used to just float around!— Meg