You file for it in the jurisdiction where the child legally resides.
Is he needing custody of his child, or is this on himself?
A motion for custody or modification to an existing custody order must be filed in the jurisdiction where the child legally resides.
Yes, but child custody can not be finalized.
file for sole custody and file for child abuse and you will have possibly sole custody of thew child
Yes, if you had custody of the child during the period for which you are seeking retroactive support.
See Link BelowChild Custody- Can Fathers Win
Only NC has jurisdiction, nor should the child be taken away from the other parent.
You have the right to file for a change of custody with the court. You will have to present convincing evidence that the child's mother is unfit to retain custody of the child. Frankly: It is a stiff burden of proof to overcome to convince the court to remove a child from its mother's custody.
Custody would normally go to the closest living relative, and if there are no relatives available, the child becomes a ward of the state.
file for custody
If no custody orders exist, a motion for temporary custody can be made while in possession of the child. An emergency motion for custody can be filed with evidence of immediate danger to the child.