I would find a friend to give the wine to. Stop looking for ways to rationalize or excuse what's happening. Bottom line, you don't need the wine in the house. He's an alcoholic, putting 12 bottles of wine in front of him is adding fuel to the fire. That, IMO, is more important that keeping the wine to save Mom's feelings.
You are realizing that there are issues here...both his and yours. AlAnon could really help you sort out what is causing you to enable his disease. We learn that we didn't Cause it, can't Cure it, and can't Control it. If you really want to stick with this guy, then you have a long bumpy road ahead of you. Better to educate yourself now, so you know what you're in for. Read over in the Adult children of Alcoholics if you want to think about having kids with this guy. I don't think anyone on this forum would advise you to have children.