Ohio Rev. Code § 3127.16: Exclusive continuing jurisdiction over determination - termination.

Except as otherwise provided in section 3127.18 of the Revised Code, a court of this state that has made a child custody determination consistent with section 3127.15 or 3127.17 of the Revised Code has exclusive, continuing jurisdiction over the determination until the court or a court of another state determines that the child, the child's parents, and any person acting as a parent do not presently reside in this state.