N.C. Gen. Stat. § 48-3-206

(1) To assist the court in determining that a direct placement was valid and all necessary consents have been obtained, the parent or guardian who placed the minor shall execute an affidavit setting out names, last known addresses, and marital status of the minor's parents or possible parents. If the placing parent or guardian is unavailable to execute the affidavit, the affidavit may be prepared by a knowledgeable individual who shall sign the affidavit and indicate the source of the individual's knowledge.

(2) In an agency placement, the agency shall obtain from at least one individual who relinquishes a minor to the agency an affidavit setting out the information required in subsection (a) of this section. This affidavit is not necessary when the agency acquires legal and physical custody of a minor for purposes of adoptive placement by a court order terminating the parental rights of a parent or guardian.