no
If a court orders it.
Back child support is owed until it is paid off regardless of the age of the child since it is a debt owed from when the child was still a minor.
No, only the parent (in this case I assume the mother), who he owed the money to can do that.
Disowning a child is not a legal concept, and there are no rules. Commonly, people refer to a parent writing an adult child out of his/her will as disowning a child. In this case, yes, the parent could write them out and write them back in again as often as they want.
Only if the obligee parent is deceased and with the approval of the court.
No, only the custodial parent can do that.
yes the parent can with their card
They can gift a car, but they can't write it off.
By paying it off, provided none is owed the state, and all interest penalties are paid. see links below
Yes you can.
Legally he can't. The parent of a child cannot arbitrarily give up that child and be relieved of the obligation of financial support without following the legal procedure as prescribed by the laws of the state where the child resides.
The mother aborts, the father can't see links below