I had to end my relationship with my father (at the same time my siblings either came to the same conclusion or the court did for them). But my sister and I had major issues (not as bad as what you are describing though) for years until her wedding when I was the most miserable bridesmaid ever and I had little to do with her for years until her husband told her she was mean to me and should be nicer. I only know that b/c my mom told me so I can't thank him but we've finally established a pretty good relationship in the last several years since she had kids. Not best friends but we get along and I'm very much part of my nieces' lives. I truly never thought it could get better and still am a little shocked that it did but I am so glad.

I hope that someday your brother also sees the error of his ways.