I have, for the most part, just left it alone. He complains when he wants and I listen. However, his wife regularly calls him "Idiot", "Dick", Retard", etc. She yells and throws tantrums, threatens to leave him, had thrown things at him (raised her hand but not hit). However, now it is starting to really impact my interaction with him. Any time we go out (as a group with friends) his wife will get upset about something and he needs to jump and appease her. I have known him for such a long time and I find it absolutely painful that he is making excuses for her (and lying about things she does too).