Md. Code, Family Law § 5–334

(a) Promptly after a petition for adoption is filed under this Part III of this subtitle, a juvenile court shall issue a show–cause order that requires the party to whom issued to respond as required under the Maryland Rules.

(b) On issuance of a show–cause order as to adoption of a child under this section, a petitioner shall serve the order on:

(1) each of the child’s living parents who has not consented to the adoption;

(2) each living parent’s last attorney of record in the CINA case; and

(3) the child’s last attorney of record in the CINA case.

(c) Service under this section shall be:

(1) on a parent, by:

(i) first–class mail; and

(ii) 1. personal service; or

2. certified mail, restricted delivery, return receipt requested; and

(2) on an attorney, by:

(i) personal service; or

(ii) certified mail, return receipt requested.

(d) Service on a parent under this section shall be attempted as provided in § 5–316(d), (e), and (f) of this subtitle.