Oh Livnlearn, I do understand all the circumstances you detailed, and agree whole heartedly with "he is obliged to maintain his wife and child."!
My point is precisely that. He is obliged, so whether you are willing to negotiate on other stuff or any other issue to me is irrelevant. My thought is to not bring up any other topic into the arena that he can latch on to and ignore the one and only issue at hand - which is he MUST pay you the total amount agreed upon. It is not optional nor up for debate. It simply IS. I just felt like introducing the topic of the mortgage would open a tiny crack in the door which he could slip into and muck about with... for he's surely a clever one!
I think you're doing well in handling such difficult circumstances!
