Good for you for your sober time!
Have you talked to her and her son about your feelings? I think, in a relationship, any change (like sobriety) can cause anxiety. Change is scary and the best way through it, is to talk about it. Would it be possible for you to go to another part of the house while they are drinking? It sounds like you need to do some soul-searching and figure out what you really want out of this relationship.
I would not be able to live the way you are in early recovery, and now I would never want to live that way.