The petitioner shall serve a copy of the filed petition and notice of hearing on the petitioner's parent or parents, guardian, or custodian at least fifteen days before the emancipation hearing. No summons shall be required. Service shall be waived if proof is made to the court that the address of the parent or parents, guardian, or custodian is unavailable or unascertainable. The petitioner shall also serve notice of the hearing on the department of children, youth, and families if the petitioner is subject to dependency disposition order under RCW
13.34.130. The hearing shall be held no later than sixty days after the date on which the petition is filed.