Sorry to hear about that... You really find out who loves you / true family and friends are when things get tough though...
We've had years of dealing with, in our home, various in laws with this, that or the other medical problem that ended up on their collective cans. So I feel your pain man. You are doing what a brother should. Hopefully you can get some help with his care, and not have the constant fights my wife and I are having with her siblings about my 85 y/o dementia patient FIL's care... I don't want to fuss other than to give you a heads up, keep your character about you, and take care of yourself first. We didn't at first and there are far too many days when my fuse is too short...