One more question...
You mentioned in your first post that your wife "does not know what is going on." Are you saying that she sees and experiences both of her parents as getting drunk and being A's and she doesn't realize that this is addictive behavior??? That is why I wondered if your wife is drinking along with them. I can't imagine why your wife would want to be around her parents and their bad habits unless she, too, is joining in at their "party."