Hi F.,
I know all to well what your going through.
It's times like these that we realize we need more then we can give. There are some really good suggestions on the comments below.
I wouldn't turn my back on him, He is sick. But, You should set some rules and stick by them. It's like any child, telling them over and over to do something and not follow through with your intention to do anything about it only allows them to continue because they know you won't. They now control the situation.
I think therapy is a great idea. I also think that if you have a church near you that you can just go in and sit by yourself and have a one on one with yourself and God, that would be great too.
Listen to your heart and you can't go wrong. In saying that, it doesn't mean you let everyone or anyone run all over you. If what you've been doing isn't working, then it's time to do something else and some of these ladies have great ideas.
I send you and your family Love and Light to the situation.
Love and Light,
Rev. G. Hudson, Reiki Master.
www.reikigailhudson.com