Well, if this is your family situation, I am so sorry. But you can't help him unless he wants the help. That may sound trite, but it is true.
A rehab program or Al Anon may or may not help unless he wants to find a life outside of that bottle.
For what it's worth, I understand, as my father was an alcoholic, and too many other family members had this problem, this addiction. It's a living hell. Don't fall into the co-dependency trap, it doesn't help anyone.
I wish you luck, for all addictions tear apart the fabric of the family, and the one thing I'm sure of, is that he needs some professional, objective intervention, for there is a depression that accompanies this disease that family members alone cannot effectively address. Continue to love him, but don't help him stay within the bottle.