Okla. Stat. tit. 58, § 58-661: Settlement of advancements

All questions as to advancements made or alleged to have been

made by the decedent to his heirs may be heard and determined by the

county court, and must be specified in the decree assigning and

distributing the estate; and the final judgment or decree of the

district court, or in case of an appeal, of the district court or

Supreme Court, is binding on all parties interested in the estate.