Sheltie - your brother and your family are in my prayers.
I never knew much about ALS, but saw a segment on Real Sports that broke my heart. It is such a terrible disease because it affects the lungs but not the mind. Remember, no matter how sick your brother looks and feels his mind is still 100% and he needs the family support.
Links below - three parts....
Part1
Part2
Part3
Was your brother an athlete or otherwise did he get hit on the head?