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If the person who has the child is not the biological relative of the child, then you need to file a petition for guardianship/conservatorship in the local court and obtain a court order to get the child. Under the laws, the biological parents and grandparents are supposed to have legal rights to the child as long as they are fit to raise the child. So your next step here is you must have a local attorney representing you to file for guardianship/conservatorship in the court and that is the only way you will get him back.
If you cannot afford a local attorney, you can go to the legal aid office near you or call the SC Bar and ask them for the pro bono attorneys in your area who can assist you in filing this in the court.