(a) An award of custody to a third party under this chapter may be modified or terminated upon the motion of any party, or on the court’s own motion, upon a determination that there has been a substantial and material change in circumstances and that the modification or termination is in the best interests of the child.
(b) When a motion to modify an award of custody to a third party under this chapter is filed, the burden of proof is on the party seeking a change, and the standard of proof shall be by a preponderance of the evidence.
(c) Any award of custody based on revocable parental consent entered pursuant to the agreement of all parties under § 16-831.06(d) shall be immediately vacated and of no further effect upon the filing of a revocation by the consenting parent or the third party.