HRS §583A-307
What happens when two states are handling the same case
If a court in Hawaii is enforcing a custody order and learns that another state's court is already working on changing that order, Hawaii's court must contact the other court right away. The enforcement case continues unless Hawaii's court decides to pause or end it after talking with the other court.
courts
The statute, as written — Simultaneous proceedings
If a proceeding for enforcement under this part is commenced in a court of this State and the court determines that a proceeding to modify the determination is pending in a court of another state having jurisdiction to modify the determination under part II, the enforcing court shall immediately communicate with the modifying court. The proceeding for enforcement continues unless the enforcing court, after consultation with the modifying court, stays or dismisses the proceeding.
LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.