Except as otherwise provided in § 1923 of this title, 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 § 1920(a)(1) or (2) of this title and:
(1) The court of the other state determines it no longer has exclusive, continuing jurisdiction under § 1921 of this title or that a court of this State would be a more convenient forum under § 1926 of this title; 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.
Structure Delaware Code
Chapter 19. UNIFORM CHILD CUSTODY JURISDICTION AND ENFORCEMENT ACT
§ 1920. Initial child custody jurisdiction.
§ 1921. Exclusive, continuing jurisdiction.
§ 1922. Jurisdiction to modify determination.
§ 1923. Temporary emergency jurisdiction.
§ 1924. Notice; opportunity to be heard; joinder.
§ 1925. Simultaneous proceedings.
§ 1927. Jurisdiction declined by reason of conduct.