Pogostick, you and the family should check into going to Al-Anon meetings.
You can take an alcoholic to AA, pay for all kinds of doctors, therapists, and rehabs, but if the alcoholic does not want to stop drinking, he will not stop drinking. I know you have hope and good intentions, but you cannot fix this.
IMO, the most loving thing you can do for him is to set boundaries for yourselves, that is, what behavior you will and will not allow in your home. Then, communicate the consequences as to what will happen if your boundaries are not respected.