I witnessed my son try to discipline his daughter. Daughter in law repeatedly challenged him and totally emasculated him in front of me when he continued. She's a wonderful daughter in law and friend, and at my suggestion purchased your books and implements most guidelines. 5 year old granddaughter told me her parents have fought in her presence and once she had to scream for them to stop. My question is: Since this occurred in my presence, and since granddaughter mentioned fighting, do I do or say anything?