That I attempted suicide when I was 10 y. o. (I'm an adult now), because I couldn't stand their violence, screaming and humiliation anymore. If they had found out, I would have probably got beaten and severely punished. If they find out now, they'd probably mock it. They never understood the pain and damage their abusive behavior caused me.
(I moved away and went low contact with them. I'm in therapy for almost 3 years and doing much better now.)