(a)  Notwithstanding any other provisions of this chapter, a decree of adoption or a termination of a parent’s right to give or withhold consent for adoption shall not be subject to a challenge or petition to reverse unless the challenge or petition is filed in the family court within one hundred eighty (180) days after the decree or order is entered.

(b)  In the event a challenge is brought within the one hundred eighty (180) day period by an individual whose parental relationship to an adoptee is terminated, or by any individual who is asserting a parental relationship to the adoptee, pursuant to the provisions of this chapter, the family court shall deny the challenge unless the court finds by clear and convincing evidence that the decree or order is not in the best interest of the adoptee.