I agree with not forcing your H to try and see S. His seeing S is a choice he needs to make. At this point you do need to be "both" parents for S. You sound like a very, very strong woman so I have no doubt that you can do it and provide the very best loving environment for S. Does it suck that you have to do that, yes. Being a father myself of two young boys I couldn't see how anyone could be so irresponsible. However, based on reading a bunch of sitchs it never fails that the WAS does some pretty amazing crap.
No issues on the input about the money. What about taking the extra hundred and putting it into a savings account for S. If H ever trys to pull anything regarding the money you can show that there is an individual account for S. Just another thought.
M 33 | W 34 | Kids: S4, S3 M: 5/28/05 Bomb: 8/22/09 EA: 8/1/09 | PA 12/26/09 W L: 10/21/09 M L: 11/16/09 | 12/09 to file SA W & Boys Move Out: 3/14/10