My grandmother completely convinced her little brother that he was adopted because his name didn't end in a y-sound like the rest of their family's names did. He never told their parents, but still worried years later that he really was adopted.
A childhood belief about names

others believed things like this
- My mum told me and my brother that we were adopted and that our real mothers were witches. Thanks mum.Anon
- My brothers to piss me off sometimes told me I was adopted, and that I was the housekeeper's kid.— ricolarno
- When I was younger, my cousin used to try to convince me that I was adopted and I sometimes believed it."Anon
- I used to believe that echos were actually the sound going completely around the world and coming back to you.— kyle
- When I was a kid I was completely convinced that Sade's "Smooth operator" was "Ooh of the red eye".— Brookstar78
- My Grandmother once told me she could unscrew her feet. I believed that for years.— Andy Bettison