Okla. Stat. tit. 10 § 93
When the petition mentioned in 10 O.S. 1971, Section 92, is filed the court shall fix a day for the hearing thereof, which day shall be not less than fifteen (15) nor more than thirty (30) days from the date of the filing of the petition. Notice of the hearing of the petition shall be sent by certified mail, return receipt requested, delivery restricted to addressee only, to the parents of the minor, if living, to the guardian of the minor, if one has been appointed, or to the person who has custody of the minor if such person is other than parent or guardian of the minor, and if both of the minor's parents are dead, the court may order that notice be sent by certified mail, return receipt requested, delivery restricted to addressee only, to other relatives of the minor; provided, however, that no notice shall be sent to a person who endorses on the petition that notice of the day of the hearing is waived. Notice of the hearing shall be given by publication in some newspaper printed in the county where such petition is filed, and if there be none, then in some legal newspaper having a general circulation in the county one time, at least ten (10) days prior to the day set for the hearing of the said petition. Before the court may enter an order conferring majority rights in the hearing provided for herein, proof must be presented to the court at said hearing that notice was given to all persons entitled thereto as provided herein.
Okla. Stat. tit. 10, § 93