My brother, at age 4, used to believe that you could only marry someone you love, and the only girl he loved in the world was me (his sister), so he would have to marry me.
A childhood belief about marriage

others believed things like this
- I Used To Believe That You Can Marry Your Sister Or Cousin As Optional!— KellGirl
- That you had to marry your sibling. During this period of time I devoliped a crush on my brother.— don't worry I'm a girl
- I used to think I was going to marry my mom, even though my dad was already married to her.— nick
- I used to believe you had to marry your siblings when you grew up.— Cade Whitbourn
- I used to believe that if you kissed someone you HAD to marry them. Even in the movies.Anon
- When I was at primary school I used to believe you could only marry someone who was the same height as you!— Lucy