I'm so sorry to hear about your brother.
It seems like almost every family is touched by cancer these days. Being an only child, I didn't experience exactly what you're going through and others have mentioned, but I did lose my mother way back in 1969. She was only 56 at the time and never got to see any grandchildren.
My prayers will be with you, Jim and the rest of your family that his last days may be peaceful and painfree. The Lord is waiting with open arms. Take good care of YOU too.....
Love,