The best way to deal with a crazy AH is to engage him as little as humanly possible. Like, mine doesn't even know where I work, what I make, etc. If legally I have to tell him I will, but until then, it's none of his business. I would never answer his questions because your answers will NEVER be right no matter what you say, he will always find an argument to pick. My AH is in rehab right now so I don't have to share custody, so I am able to go totally no contact, but you should try to have as little contact as you can. It just never ever goes well. They love to fight, to engage, to get your attention in any way possible.