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No, child support is not determined by order of birth. They try to make payments equal for each child unless it is a different state's order that applies to the other child. You may not get a car or anything, but you should file a motion to modify in court asking the court to look into this man's finances. They can usually figure out if a person is hiding or lying about their financial situation. I have seen it in court myself. The judge was about to arrest someone and suddenly they produced a few thousand dollars.
The judge will often ask them questions like how do you eat, how go you go places, etc. and that usually gets an admission out of them. IN the very least, child support services should have gotten some disability income for your son. Have you applied for social security disability for your son as well due to his condition?
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