Tenn. Code Ann. § 36-6-218: Jurisdiction to modify foreign decrees

Except as otherwise provided in § 36-6-219 , a court of this state may not modify a child-custody determination made by a court of another state unless a court of this state has jurisdiction to make an initial determination under § 36-6-216(a)(1) or (2) , and:

(1) The court of the other state determines it no longer has exclusive, continuing jurisdiction under § 36-6-217 or that a court of this state would be a more convenient forum under § 36-6-221 ; or

(2) A court of this state or a court of the other state determines that the child, the child's parents, and any person acting as a parent do not presently reside in the other state.