To my knowledge, there is no prohibition on collection of child support by more than one State as long as the total amount collected doesn't exceed the amount due (including arrearages, penalties and interest). Each State must have an appeals process for resolving disputes about the amount collected; however, the time to file such appeal is usually fairly short.
yes
no
His parents pay for him and he pays child support for his baby.
Back support is owed the obligee parent, however any continuing support can go to the child.
Generally no, though there is a presumption of primary residential custody for the obligee parent. In states like California, the amount of time the obligor parent has the child affects the amount of child support ordered.ClarificationChild support orders and custody orders are separate. Generally, the parent who pays child support pays it to the custodial parent.
Child support is court ordered. The judge decides who pays child support and how much.
The parent that pays child support does not need to pay child support for her child`s kids, only the current right parent.
In short, no one.
from child support enforcement
Depends on the state.
Social security
Yes, if she has an older child she currently pays child support for.