I'm sorry, this sounds awful. I have come to realize that there are lot's of us, like you & I, who would never know or have anything to do with some people if we weren't related to them.
That being said, you won't be the first person to make your own path without your relatives in your life.
I am sorry you tried to be supportive and it backfired.
Sending good thoughts & some extra resilience your way. And prayers for No More stress on your health