C.S.
Hello J.,
If the father of your son is the same as your daughter it's going to be a draw. Because of the disabilities both of you are sharing the responsibilty of caring for children who have special needs. But, you can go to your local DFS office and take your ID social security cards, birth certificates, divorce degree or separation order. They will give you the forms to fill out and you may have to write a short summary of the situation. It takes time it is not a quick process, or you can contact a lawyer who specializes in child support. It's free through DFS just alittle longer of a process. Good Luck!!
C.