(a) If, after termination of parental rights as to a child, there is an open guardianship case, a petition for adoption of the child may be filed only as provided in this Part IV of this subtitle.(b)(1) Any adult may petition a juvenile court for an adoption under this Part IV of this subtitle.(2) If a petitioner under this section is married, the petitioner's spouse shall join in the petition unless the spouse: (i) is separated from the petitioner under a circumstance that gives the petitioner a ground for annulment or divorce; or(ii) is not competent to join in the petition.(c)(1) A petitioner under this section shall attach to a petition: (i)1. all written consents required under § 5-350 of this subtitle; or2. if applicable: A. proof of guardianship or relinquishment of parental rights granted by an administrative, executive, or judicial body of a state or other jurisdiction; andB. certification that the guardianship or relinquishment was granted in compliance with the jurisdiction's laws;(ii) a copy of an agreement, if any, for postadoption contact; and(iii) a notice of filing that:1. states the date on which the petition was filed;2. identifies each governmental unit or person whose consent was filed with the petition;3. if applicable, states that a postadoption agreement was filed with the petition; and4. includes no identifying information that would be in violation of an agreement or consent.(2) In addition to a copy of an agreement for postadoption contact, a petitioner shall file the original agreement under seal.(d) If the marital status of a petitioner changes before entry of an order, the petitioner shall amend the petition accordingly.