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Contact your county's department of human services and ask them what sort of priority your son would have for the same services were he moved to the county. The federal government pays for these services, but the county is obligated to disburse and it can pretty much make its own rules as long as it doesn't discriminate between recipients.
First of all, you have no obligation to pay for any answer. That said, your facts don't provide much information with which to provide much of a response. I don't know what you're looking for. If you call the county and they decline to help because of A, B, C, etc., then that's when you start investigating whether you have a rationale to sue the county to force it to help.
But, until you know what that answer is, I can't give you any idea of how to respond.
As you wish...good luck to you.