what if your mother in law does not tell the truth?

I think I would be prepared for these complaints with a subject that can change the conversation. If that didn’t work I think that I would tell all of them that I would not hear any more complaints about the mother-in-law because it is disrespectful of her. And tell the mother-in-law the same thing. I would try to do it in a loving way. I would say I love both of you and it hurts me when you say these things about each other. Hopefully that would put a stop to the complaints