Okla. Stat. tit. 43, § 43-551-206

SIMULTANEOUS PROCEEDINGS

A. Except as otherwise provided in Section 16 of this act, a

court of this state may not exercise its jurisdiction under this

article if, at the time of the commencement of the proceeding, a

proceeding concerning the custody of the child has been commenced in

a court of another state having jurisdiction substantially in

conformity with this act, unless the proceeding has been terminated

or is stayed by the court of the other state because a court of this

state is a more convenient forum under Section 19 of this act.

Oklahoma Statutes - Title 43. Marriage and Family Page 151

B. Except as otherwise provided in Section 16 of this act, a

court of this state, before hearing a child custody proceeding,

shall examine the court documents and other information supplied by

the parties pursuant to Section 21 of this act. If the court

determines that a child custody proceeding has been commenced in a

court in another state having jurisdiction substantially in

accordance with this act, the court of this state shall stay its

proceeding and communicate with the court of the other state. If

the court of the state having jurisdiction substantially in

accordance with this act does not determine that the court of this

state is a more appropriate forum, the court of this state shall

dismiss the proceeding.

C. In a proceeding to modify a child custody determination, a

court of this state shall determine whether a proceeding to enforce

the determination has been commenced in another state. If a

proceeding to enforce a child custody determination has been

commenced in another state, the court may:

1. Stay the proceeding for modification pending the entry of an

order of a court of the other state enforcing, staying, denying, or

dismissing the proceeding for enforcement;

2. Enjoin the parties from continuing with the proceeding for

enforcement; or

3. Proceed with the modification under conditions it considers

appropriate.