About two years ago, my fiancee's parents began arguing over the smallest things. Now it has turned into a daily all-out screaming/shouting war between them, with my fiancee caught in the middle. Everyday when she gets home from work exhausted, her mother expects her to take her out until 10:00 almost every night because she has been there fighting all day and no longer wants to be around her husband. My fiancee takes her because she is sympathetic and afraid that her father may hit her mother. Both are in their mid-70's and neither in the greatest of health, but they are by no means helpless. My fiancee thinks that by staying there and playing referee, she is helping. However, things have only gotten more toxic in her parent's relationship, and it has made her very sad, unhappy, and borderline depressed. She has gotten drug down by all of this. It has also affected our relationship (of 7 years) greatly, as we never see each other, and all affection and intimacy is gone between us from the stress she endures worrying about her parents (which is constant). I keep trying to get her to just put up some boundaries and distance herself from all this, as it's gone on for two years on nothing she has done has improved anything. I keep trying to show her how it has so negatively impacted her, and as a result our relationship has been decimated in the crossfire. I have suggested to both of them to take up new hobbies or activities, but neither of them care to. They just want to stay home and argue/fight. It's like if one of them leaves, they are admitting defeat and the other will become "king of the castle" How can I convince her that she cannot be responsible for their happiness, and that it is wrong of her parents to expect her to be in the middle and referee their arguments/fights? What can I do to save our relationship?