Believe me when I say that I understand. I have such huge issues with my mother-in-law. I have done everything I can to make peace for my son's sake and she tells him (he's 11) what a bad mother I am. She makes it so a child has to stick up for his mom. He has started to not want to go there. My husband is an only child and is apparently cut out of her will unless he divorces me. I have no contact with her and my mental health has been better with not dealing with her. I also have no family around, although I come from a large family everyone lives 2000 miles from me, so no family support.
I am sorry to hear of your losses, they are so hard to deal with.

If you need to talk just pm me. As you can see my avatar is about m/c and infant death.