Totally get it. It’s a horrible situation to have lived with and it’s taken me 3 years to finally tell mine to leave. It just got so bad I couldn’t keep the children from seeing/hearing what was going on. They didn’t need that any more than I did. It has to be his choice to want to stop drinking and unfortunately until he admits he has a problem he will probably keep believing that he is doing no wrong. If he does involve courts etc I’d like to think that his drinking would be a valid reason to keep him from your daughter. Once he starts to get help, things could then change. It could be the kick start he needs?