I wish it was that easy Cat, but I believe one of two things will happen. It will either destroy him or it will be just swept under the carpet like it never happened.
I fear it would hasten his demise as he has major heart issues and I don’t want to put that kind of stress on him.
My father and I have only ever had two arguments in my entire life. The second one was when I tried to start to tell him what she had done. Sadly he got angry with me and didn’t talk to me for two years, after which he did tell me he knew she was wrong, not me. That’s when I moved away over 30 years ago. He is an extremely stubborn man.