How can I help my 76-year-old father-in-law is an alcoholic and a womanizer?

This is so sad. If someone could get to him and get him into treatment that would be good. Is he a veteran? They are generally very good about coping with alcoholic elders. Alcoholism is a disease, but it can cause people to do thing like your FIL is doing. If he's been drinking a long time, he may be going into alcohol induced dementia. He needs medical help badly, and as you know, getting him to get help isn't easy. Try the VA if he qualifies.

Good luck,
Carol