Okla. Stat. tit. 84, § 84-251: Proceedings authorized - Jurisdiction - Final

determination - Appeal.

The District Court having jurisdiction to settle the estate of

any deceased person is hereby granted original jurisdiction to hear

and determine the question of fact as to the heirship of such

person, and a determination of such fact by said court shall be

conclusive evidence of said question in all the courts of this

state. Provided, that appeals may be taken from said district court

within the time and in the manner provided by law as in other

probate matters. If no appeal is taken the judgment of the district

court shall be final, and in all cases appealed from the district

court when a final determination thereof is had, same shall be a

final determination of such fact of heirship. Provided, that where

the time limited by the law of this state for the institution of

administration proceedings has elapsed without their institution, as

well as in cases where there exists no lawful ground for the

institution of administration proceedings in said court, a petition

may be filed therein having for its object a determination of such

heirship and the case shall proceed in all respects as if

administration proceedings upon other proper grounds had been

regularly begun, but this provision shall not be construed to reopen

the question of the determination of an heirship already ascertained

by competent legal authority under existing laws.