Dumbest thing your parent ever told you that you actually believed as a child??
Mine has to be when I was about 7. I noticed that My Great-Grandma's sister Dee (My Auntie Dee)was not married and didn't have kids. I asked my dad
"Dad, Why didn't Auntie Dee get married and have kids?"
Dad; "because there were not enough men back when she was young, so she didn't get to get married"
I just figured okay and forgot about it
I learned years later, Auntie Dee was a lesbian and lived in a small house behind her sisters house with her girlfriend and had for longer then I was born!! LOL