You better stick to figuring out your own problems and what you need to do for you. It sounds like you're reasonably good at that. A lot better than he is.

It may be that the only reason your husband has any job at all is that he's working for family. He may not be capable of holding down a job where people aren't bending over backwards to tolerate him, which is what I think is going on with the father-in-law. If he needs any counseling, you're not the person to give it to him. You seem to have zero insight into what is going on with him.

You talk about not wanting to be a housewife to please him. I got a strong feeling he'll be looking for you to financially support him one of these days. His problem is that he thinks he is worthless. He was hoping you could fix that in him, but nobody can do that. Like you say, in a few weeks you can move on. You'll probably be fine, whatever you decide to do. He is very damaged and deteriorating. He sounds to me like a guy headed for a nervous breakdown.