What's the weirdest/most shocking thing you ever learned about your parents?

I was 22 when my dad told me that he used to have regular orgies with a group of sisters. He said they paid him $1000 a session.

It was 4 sisters. Once a month. They'd then bathe and sing to him.

He later found out that they were trying to start a cult and wanted him to be their "leader". He declined their offer because he said he could have sex with the women, but never fall in love with them.

The orgies continued until the week before one of the sisters got married.

My dad was invited to the wedding but went alone with his boss. He then met a beautiful girl singing at the reception.

They went out on two dates and the girl revealed she lived out of town. My dad followed her & stayed the night.

That girl, was my mother.