It sounds like his first step is to get a lawyer and find out his rights in all of this. The kids will have a hard time, for sure, but from what I know they have a harder time when later in life they find out that their miserable childhood's were because of their parents hatred for one another and insistence that they stay together for them.
I have heard that kids from happy divorced parents are generally better off than those that grew up in a miserable household. Actually, to go along with that; I have heard that kids need solid committed adults in their lives regardless of who they are. Someone that will keep them on task, talk with them and nurture them with love... That's it. They will likely be better off if they were not together.
Anyone want to be friends on Facebook?
Send me your name via PM