It's interesting that you just mentioned boundaries because I was just reading about it on this forum.

I have had similar issues with my M-I-L. She was incredibly disrespectful to me as a wife/mother/homemaker. It got to the point where I would ask her to stop, and she would for a little while, then she would start in again. It got to the point that I couldn't tolerate visits anymore and just decided to cease all contact with her. She escalated and tried to commit suicide. She told my husband that I was the reason she almost died. Then she called my mother to tell her the same thing.

I know that none of that was my responsibility, but I can see where my husband has learned this behavior.

I know I need to set boundaries. But I have also read about not trying to control the other person's behavior. I will work on this but I have yet to find that balance.
What do I do if I try to set a boundary, and the other person just escalates?