From what I heard last night on the Parent Education class I had to take to get a D, I'm not surprised. In the end, he is going to defend both of you.
If you think he isn't safe over there, then you have to contact the authorities. If you think it's bad, and inappropriate, but not dangerous, you have to think very carefully.
How she lives her life isn't your problem. But, S's welfare is. I don't have any more advice!