So is an alcoholic

My so is definitely a functioning alcoholic; he drinks every night and once he starts he can't stop. If he gets too drunk he will pee in our bed :-/ and it's gotten to the point that our 5 year old is noticing, the next day if he's hung over she'll say things like daddy's not feeling well and I think he had to much beer. I don't know what to do or how to handle this.