Have you ever thought about moving FAR away from them ? Distance ends a lot of that.
I come from a whole family who are BULLY'S and BI-POLAR and none of them know it. They think I am the problem. I have spent YEARS working on myself and trying to understand the dynamics of the family only to learn that I will probably NEVER break through to them......they are never wrong and that I cannot live with the DENIAL of almost every issue that comes up.
We have been estranged for many years and I am happier, and healthier for it.
SAD but TRUE. Sometimes ....ALL YOU CAN DO.............is SAVE yourself !