Except as otherwise provided in § 20-146.15, a court of the Commonwealth may not modify a child custody determination made by a court of another state unless a court of the Commonwealth has jurisdiction to make an initial determination under subdivision A 1 or A 2 of § 20-146.12 and:
1. The court of the other state determines that it no longer has exclusive, continuing jurisdiction under § 20-146.13 or that a court of the Commonwealth would be a more convenient forum under § 20-146.18; or
2. A court of the Commonwealth or a court of the other state determines that neither a parent of the child, nor the child, nor any person acting as a parent of the child presently resides in the other state.