What will happen to the state court hearing if other state registers the order and rules to take the jurisdiction?

An Ohio Juvenile Court has made all orders relating to child for 9 years including 3 rulings on its Continuing Jurisdiction. The current Order, effective as of 2011, includes mom, dad and a relative. The relative and dad have legal shared custody. They also have shared parental rights and responsibilities and the mom has limited parental rights and no unsupervised contact with child. A shared parenting plan is incorporated in the Custody Order. The Order states this Court retains its Jurisdiction to Enforce and Modify any and all provisions of this Order in the best interest of the minor child as provided by law. Now (2yrs later) with new hearings pending including pre- trial for father's 10 straight weeks of violating the parenting time of the order, he made application to a Kentucky CSEA for services. They have filed a complaint to register foreign support order through Kentucky Family Court with request that Kentucky Family Court take Jurisdiction over mom, dad and minor child to enforce and modify Foreign Order. Attached is the Ohio Custody Order. The CSEA complaint makes no mention of the relative who has the shared custody, rights and responsibilities and no notice was sent to her or the Ohio Juvenile Court. Kentucky hearing is December 27 and Ohio's pre trial is in January. What about the rights and custody of the relative not mentioned in the Ky Complaint?