Okla. Stat. tit. 58, § 58-62: Citations issued to whom

Upon filing the petition, a citation must be issued to the

executors of the will, or to the administrators with the will

annexed, and to all the legatees and devisees mentioned in the will,

and heirs residing in the state, so far as known to the petitioner,

or to their guardian, if any of them are minors or adjudicated

incompetents, or their personal representatives, if any of them are

dead, requiring them to appear before the court on some day therein

specified, to show cause why the probate of the will should not be

revoked. A copy of such citation shall be mailed to all such

persons, nonresidents of the state, whose addresses are known to

petitioner, at least ten (10) days before such hearing.