I thought that King and Queen were titles like Mr and Mrs that you could use when you were in a royal family. So when a prince and princess got married, they'd automatically become King and Queen So-and-So.
A childhood belief about marriage

others believed things like this
- I used to believe that Prince was the lead singer of Queen— Garrett
- I used to believe that my mum was the queen. She does look a bit like the queen... minus the orb and sceptre.— Vix
- When the Queen Mother died when I was quite upset because I thought royalty did not die.— Carrie
- I used to believe that if the queen died we would all die too. I think it had somthing to do with bees.— Darrell
- i used to believe that if i was good at school, i had a chance of becoming the queen????— donia
- when i was a kid, i used to believe i was actually a king who was in a coma dreaming about being a kid.— r