I'm sorry this happened to you, but happy you had some clarity and decided to leave the relationship. I've seen it and said it alot: when someone shows you who they are...believe them! He is an alcoholic who is not ready to stop. You can't change that, it's his decision.
You have a child to protect. You have your own serenity to protect. It's only been 14 months. You now see what's ahead of you stay in the relationship, easier to get out now than in 5 years.
I would suggest that you go no contact at this point. He will continue to call/text etc, he will try his best to keep you engaged. I also wouldn't discuss this with his parents any further. Honestly, it's not your place to talk to his folks about it. So at this point, you made your decision, let it go and move on from this guy.