Md. Code, Family Law § 5–333

(a) Within 5 days after a petition for adoption of a child is filed under this Part III of this subtitle with a juvenile court, the clerk shall send a copy of the petition, with the notice of filing that was attached to the petition, to:

(1) the local department with custody of the child;

(2) each of the child’s living parents who has not waived the right to notice;

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

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

(b) Notice under this section shall be by first-class mail.

(c) Notice to a parent under this section shall be sent to the parent’s last address known to the juvenile court.