Barb, I read last night but needed to get to bed so I figured I'd answer today. I don't always get responses either, but I hang around and chime in occasionally!. I think you are probably your own best resource! You know your X better than anyone. Do you think he would really do anything, or is he just puffing up his chest and trying to intimidate you so he can get his way? If he does try to pursue this legally, I would think that the precedent has been set. And when you factor in Ryan's disabilities and your X never having really been a caregiver to Ryan, I think you will come out ok. Does his visitation have any effect on support paid? My X always says he wants more time with the kids (while not actually spending all of his allotted time with them) and I know the heart of it is that if he had more time he would pay less support. Does this factor into your X's sudden desire?
"You can't stop the waves, but you can learn to surf." Jon Kabat-Zinn