this may sound cruel but you need to scare him. after he passes out, put burnt coffee grounds into the toilet with some red food coloring sprinkled around it and when he wakes up, tell him he puked blood and needs to stop drinking. only the fear of an early grave stopped me from drinking, but now i'd welcome it. that's the rub off. once sober he'll self-reflect on the time he wasted drunk and that will fuel him to change himself, or devour his soul and send him into depression.
Canada