I am so sorry he has a long tough road ahead.Know one knows why this happens but we know it happens for a reason. I dont think God does anything without a great loving reason. I know the thing that helped me with my Aunt is to look at it as positive as you can. I noticed that everyone used to talk about her like she was going to die no matter what like she was already dead. I always tried to think of it as yeah she was going to die as we all will someday but she was going to die in Gods time, And she was still alive. I dont know if this makes much since but like every one says you should consider everyday your last because it could be. I will keep you all in my prayers esp. your brother.