i used to believe that my grandparents on my father's side were both my parents' parents. I only worked out that this would mean my parents were brother and sister when i was about 10.
A childhood belief about family

others believed things like this
- I used to believe my parents were brother and sister, and that everybody's parents were brother and sister.— Rachael
- First I believed that my parents were brother and sister. Then I thought that my dad was also my mums dad. — Rainbow
- Ironically my parents were born on the same day; so growing up, I thought all parents had the same birthdays. Anon
- I used to think that if you met your parents' boss, your parents would be fired!! AAAAAHHHHHHH!!!— Spoot
- When I was little my parents used to tell me and my sister that carrots were "orange candy." — Nancy
- I used to believe that my parents and sister were alligators underneith there zip on human costume...haha— Alyssa