Relationship finally broken down with alcoholic dad

[ilovewoody]

My dad and I have always had a difficult relationship. He is an alcoholic but in denial. He drinks every day, treats my mother like crap, is difficult, argumentative and really resents me because I challenge him on his behaviour and he hates that.
I managed to leave an alcoholic husband 2 years ago as i was fed up making excuses for him and pretending things didn't happen.
Because of this I am unable to forgive my dad for his most recent outburst. In short, I was on holiday with my folks for my birthday, he got ridiculously drunk in a restaurant, refused to pay bill, got physical and abusive with me when I tried to intervene, restaurant threatened to call police.
Since we have returned home (6 weeks ago) I have spoken to him once and he said he hadn't done anything wrong.
I am humiliated, sad, shocked and disgusted by his behaviour and I want nothing more to do with I'm. I have no respect for him and do not want him in my life as long as he is drinking.
My issue is that I can't go to visit my mum as often as I would like and I would like her just to leave him and we wouldn't have to deal with I'm again.
Thanks for reading if you have. Don't have anyone I can talk to about this.

[ilovewoody]

Mum and I don't really talk about it. It's like an elephant in the room. Have been thinking about al anon for myself though. Bit nervous about doing that though