I am sorry to hear all the tribulations you are going thru with your wife. It sounds like a very complex and intense situation. You and your whole family will be in my prayers.
As for Alanon and Alateen, definitely great resources. I think your son would specially benefit from Alateen. He is in such a difficult age anyways. My H's dad was also a violent and abusive alcoholic and H told me that Alateen saved him - his mom initially made him go when he was also 13. He said that the best part for him was to realize that there were many other kids just like him and that it made him feel understood and gave him a sense of belonging in a way that his mom nor his siblings were able to provide for him.
(((hugs)))
Me & H: 44 D7, D6, S3 Together: 20y, M: 17y EA: 11/13/10, Sep: 12/23/10 EA becomes PA: Spring 2011 H filed for D: 09/06/12 D Negotiating began 2/15 OW seemingly gone on 3/15 Still negotiating D