Replies to 'We Disagree On Punishment'

I need some clarification he knows she is lying and won't do anything about it? If he does know then he is in denial and there is nothing that you are going to be able to do to make him accept it. If he doesn't know then if I were you I wouldn't be the one to tell him. It will drive a wedge between the two of you. If there is a neutral person who can verify this and they are someone he can trust then I would try to set that meeting up. Either way that is a touchy subject.