Okla. Stat. tit. 12, § 12-236a: Party defendants in real property actions

In an action involving real property any person appearing in any

manner in the title thereto, or claiming or appearing to claim some

interest in the real property involved, may be included as a party

defendant by naming such person as a party defendant in the caption

of such petition; and when such person is made a defendant in the

body of the petition under the appellation of substantially the

following words "said defendant named herein claims some right,

title, lien, estate, encumbrance, claim, assessment or interest in

and to the real property involved herein, adverse to plaintiff which

constitutes a cloud upon the title of plaintiff and defendant has no

right, title, lien, estate, encumbrance, claim, assessment or

interest, either in law or in equity, in and to the real property

involved herein", that same is sufficient to include any and all

claims, known or unknown, that such defendant may have in and to the

real property involved in such case, it not being necessary to set

out the reason in the petition, or other pleading, for such person

being made a party defendant.