You're in Florida? Doesn't the NCP pay the child support via the Revenue Dept in Tallahassee? If the NCP hasn't been paying his child support, his license should have been suspended. If this happens 3 times, he could lose his license for 5 solid years.
She can petition the courts for child support from you. A paternity test may be ordered by the court. If you are indeed the father, no judge will allow you to sign away your parental rights.
You will have to petition the court to change the custody. If your aunt is agreeable to the change and you use the right forms, it would probably not be very difficult to accomplish. Have you been paying child support? If so, that too would have to be addressed in the petition in order to...
I'm pretty sure you have to file a change of custody petition with the court in MS. The judge will decide whether it's in the best interest of the minor child to be transferred to your custody. If he doesn't know you anymore, then you'll probably have to start with visitation to build a...
My understanding here in Florida is that, if the defendant can't be served papers, the courts then use constructive service (an ad in the classified section of the appropriate newspapers). Only then, if the defendant fails to appear, the petitioner usually wins by default.