How To Treat Alcoholism And Being Verbally Abusive?

Son in law, drinks coffee for breakfast, doesn't eat all day, eats only meat & carbs - no vegetables or fruits, falls deeply asleep after dinner & is verbally abusive when someone tries to wake him. Has been known to fall asleep sitting up after a meal. Drinks beer alot. Sleeps on couch untill 2 or 3 am then goes to bed.