When my brother thought sex was disgustinghe said to me my sister 'Urgh, mum and dad had to have sex three times'.
A childhood belief about reproduction

others believed things like this
- My Sister And I Used To Believe That If You Said Something 3 Times You Would Tern Into That.
— Jason - First I believed that my parents were brother and sister. Then I thought that my dad was also my mums dad. — Rainbow
- I used to believe my parents were brother and sister, and that everybody's parents were brother and sister.— Rachael
- 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 "One, two, three times a lady"
was: "one, two, three times related"Anon