They simply fought

My wife had a fight with our daughter-in-law (son`s wife) . She asked me to stay away and to not get involved, no matter what happens. The end of it was: My 51 yo wife was slapped, kicked, face stomped and humiliated by our 27yo daughter-in-law, and everything was her fault, she started it. Not my daughter-in-law. I have to admit, I could barely believe that my wife could be so easily overpowered by a young woman, especially our son`s wife. Should I tell my son about that?