If your brother is a Christian, I suggest the following passage from the book of James. PM me for more details if so inclined. I have personally seen great healings in hopeless cases when praying in this way.
James 5:14 Is any sick among you? let him call for the elders of the church; and let them pray over him, anointing him with oil in the name of the Lord:
James 5:15 And the prayer of faith shall save the sick, and the Lord shall raise him up; and if he have committed sins, they shall be forgiven him.
blessings,
Kook