I'm Doug, and I'm very sorry to hear of your sister's situation.
While your sister can be ordered to pay child support, she will only be ordered to pay support based on her income, but she is not legally responsible for the support that the father might be able to pay if he were not disabled.
The fact that one parent may be exempt from paying child support does not mean that the other parent must pay both their share and the other parent's share of support, at least unless they are married and responsible for the marital debts
of one another.
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I wish you the best in 2012,