Okla. Stat. tit. 58 § 714
Proceedings for probate of wills of two or more deceased persons may be joined and united in one proceeding, and proceedings for administration of estates of two or more deceased persons who died intestate may be joined and united in one proceeding. Proceedings for probate of wills of one or more deceased persons and proceedings for the administration of estates of one or more deceased persons who died intestate may be joined and united in one proceeding. Where the estate or estates or some part thereof left by one or more of such deceased persons, has been or is to be received from another of such deceased persons, immediately or remotely, either by will or intestate succession, and no probate or administration proceedings have been had or commenced upon the estate of any of such deceased persons, and/or where two or more deceased persons died seized of undivided interests in property, real or personal, as tenants in common or otherwise, and no probate or administration proceedings have been had or commenced on the estate of either or any of them, and one or more of the heirs, devisees or legatees of such deceased persons are the same, the court may grant letters testamentary and/or letters of administration, as the case may be, upon such estates in any county where venue would be proper for any of the estates so joined and they may be administered in one proceeding. In all cases herein mentioned the court granting such letters has jurisdiction of each of the proceedings so united. Notice required to be published by this title including but not limited to notice to determine heirs, notice to creditors, or notice of hearing on petition for final settlement, shall be published in the county where the action is pending and the county of the residence of each decedent if a resident of this state at death. Any such proceeding before the effective date of this act shall be deemed to be in compliance with applicable venue statutes.
Okla. Stat. tit. 58, § 714