23 Pa.C.S. § 2721: Notice of hearing.

The court shall fix a time and place for hearing. Notice of the hearing shall be given to all persons whose consents are required and to such other persons as the court shall direct. Notice to the parent or parents of the adoptee, if required, may be given by the intermediary or someone acting on his behalf. Notice shall be by personal service or by registered mail to the last known address of the person to be notified or in such other manner as the court shall direct.