72-year-old father is having an affair. what should he do ？ Sever the father-son relationship?

My father is 72 years old and has always had a relationship with a woman. Children know that for a long time, we all turned a blind eye, and my old mother put up with it. I work in a foreign country. I can't control it.

Yesterday, I suddenly posted a particularly explicit language in the WeChat group at home, with that woman. Oh, I don't know what to think. I am so angry. Delete the group quickly and you can still see the news. It is estimated that children, adults, son-in-law and daughter-in-law at home have seen it. Everyone was angry and didn't sleep well last night. I don't know what to do with it. The old mother is a coward and always puts up with everything. The point is that she has no one to rely on except her old father. But my father has a bad temper. Although he has done something wrong, he is always used to taking it out on his old mother and occasionally hitting her. Mother is a very patient person.

I'm completely devastated. I don't know what to do.

I want to protect my mother. Today, I sent a short message: Either choose that bitch or choose our family, or the family will ignore him in the future. What should I do? Stop being sarcastic. I hope everyone can give me a rational suggestion.

Now our sisters have agreed that in the future, regardless of whether my father is close or not, let my old mother live with one of my sisters and we will pay together.

Why do you need so many words? Why don't you explain things clearly? How hateful.

What is this rule?