15 V.S.A. § 1073: Jurisdiction to modify determination

Except as otherwise provided in section 1074 of this title, a Vermont court may not modify a child custody determination made by a court of another state unless a Vermont court has jurisdiction to make an initial determination under subdivision 1071(a)(1) or (2) of this title and:

(1) the court of the other state determines it no longer has exclusive, continuing jurisdiction under section 1072 of this title or that a Vermont court would be a more convenient forum under section 1077 of this title; or

(2) a Vermont court or a court of the other state determines that the child, the child’s parents, and any person acting as a parent do not currently reside in the other state.