It sounds like he needs a medically supervised detox to start off with. Encourage him to speak with his doctors on the best route to go and offer him support by letting him know that you will support him if he chooses recovery.
My personal opinion is this.... he should be in control over what treatment is best for him. Let him be worried about this. The family, including yourself, should be asking each other questions of what your boundaries are and what it is you will no longer accept if he continues to drink.
Hope this helps. Welcome to SR.