DH has a cousin who is recently divorced from a woman, and I feel desperately sorry for her, but have no way of contacting her.
She was apparently sexually abused as a child by her step father. She is estranged from her family, who are in another country, anyway, because of this. (She wasn't believed, and her mother chose to believe her abuser.)
He, and his family do not believe her, and think she is just "messed up" and "attention seeking".
She now has various addiction problems, and because of this, does not have custody of her children, despite being the sole carer, while he worked abroad throughout the week, and only came home at weekends.
He often used to insist on staying with family members who really disliked her, on weekends.
Even if she was lying about the abuse (and I believe her!) she clearly needed help and support that she just didn't get.
It's horrible to feel so helpless, when you would like to be able to help someone.