God bless your Mother, Brother, and you! It is hard to lose a loved one that way.
My Dad had Alzheimer's and passed away in April 2007. Hospice was the BEST! HE remained home with my Mom (then 83 YO)and my sister. He passed away at home holding my Mom's hand. No extraordinary measures for that disease but my older brother is fighting Cancer right now and even though the treatments are expensive he seems to have won round one. His latest scan shows total remission. He is only 62.
I wish your Brother the best! Mine died at 56. He was my best buddy! He lived his life to the fullest which was likely why he died so young. I had to hide the cigarettes from him at the end. ;) He couldn’t breathe but he wanted to smoke.