Okla. Stat. tit. 58, § 58-493: Limitation of action to recover

No action for the recovery of any estate sold by an executor or

administrator, under the provisions of this chapter, can be

maintained by any heirs, or other persons claiming under the

decedent, unless it be commenced within two (2) years next after the

sale. An action to set aside the sale on the ground of fraud may be

instituted and maintained at any time within two (2) years from the

discovery of the fraud.