Oh good lord, it sounds like he's about to crack up. You really are doing everything you can, and everything you should do. You're completely right to keep the kids safe, and you're right to have removed their money from where he can get hold of it. I really really hope that he'll get to his assessment ... if he genuinely believes he's not bipolar, then tell him to go and have his "all clear" in writing. It might be a way to "trick" him into doing what's needful.

Do you have anyone to stay with? He has his mother... who do you have?