I can honestly say my Mom didn't know. If she did she would have killed my cousin. I know because I waited until I was 45 to tell her what happened to me at 9 years old.
I have absolutely no doudt she would have killed him and I was afraid then my Mom would go to jail and who would take care of us 5 kids without a Dad? My cousin died last year he was 56 years old and a nothing of a man. No job, a drunk and alone. I think he was delt with by the higher powers.