Julie, I completely sympathize with your sitch. We have S (special needs) and 2 cats and my W left 5 months ago at BD. She refuses to take the cats which were hers and only picks up S every other weekend. I feel like I suddenly do a lot of things that were shared experiences. The trick for me has been to not count on her for anything and getting used to living life as a single parent. Having expectations was a huge problem for me and I just decided I would plan to need to do everything.
I know your sitch is different because H is still there but if you can't count on his help then you are right its not fair to make your S suffer consequences.
M: 43 W: 43 Married 6 yrs. T: 7 yrs. Son 20, 18, 17, 15 yrs. (w/ Autism), 12, 10