This almost sounds like my mother's side of the family. The only difference is some of my maternal relatives are nasty towards me. These same people never cared for me either. Even my maternal half sister was nasty to me too and she abused me when we were kids. Anyway, I would suggest you set boundaries with them. If they're so toxic to the point where you can't be around them anymore, then cut these people loose. Tell them why you did it. They'll get the message sooner or later. Some may try to reach out to you, but it's best to ignore them.