The obligor (generally, the State and/or the custodial parent).
if the child is special needs and has to live with a parent yes otherwise no
Not until your child is 18
It is dependant on which state that you live in as to if the children are entitled to back child support after they are grown. You will need to consult with your local state child support office so they can better assist you with this question.
No, that is still your child. Alimony would stop but not child support.
yes
When the child reaches majority/is emancipated, the obligor still owes any support that was ordered and not paid.
no
yes
Generally, yes.
Child support that is awarded and not paid can be claimed by and adult child. A child support order usually expires when the child turns 18, but anything that is arrears can still be claimed by the child.
Doubtful. The child support is for the welfare of the child, not the mother. Check with your state child support office for specifics of the law in your state.
It depends on the state you live in and the age of the child.