Its up to you.. whatever choice you make, it will be difficult, no easy answer.

Am afraid I am one who has cut ties with both of my parents. Following a huge row 4 years ago, 5 months ago I told them that I do not want anything more to do with them, as its bad for me. They refused to talk or sort it out, so I gave up asking. I dont know why your brother has done what he has done, but he will have reasons, whether justified or not. Its also the hardest thing have ever done...

Warm hugs, its hard when families split..