First I believed that my parents were brother and sister. Then I thought that my dad was also my mums dad.
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
- Once I thought these two teenagers who used to wash my mums car lived in our attic. Hahaha!— Roxanne
- I used to think that babies were made when you press your mums belly button.
Then a baby would fall out— Chris Hyndman - I used to belive that my mum and dad lived together cause they were brother and sister— Corin
- I used to think that Cain and Able were brother and sister (with Able being the girl).— Duh
- i used to think that every family had a brother and sister and they married eachother when they got olderAnon