7 GCA § 39202: Exclusive, Continuing Jurisdiction.

(a) Except as otherwise provided in section 39204, a court of Guam which has made a child-custody determination consistent with sections 39201 or 39203 has exclusive, continuing jurisdiction over the determination until:

(1) a court of Guam determines that neither the child, the child's parents, and any person acting as a parent do not have a significant connection with Guam and that substantial evidence is no longer available in Guam concerning the child’s care, protection, training, and personal relationships; or

(2) a court of Guam 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 Guam.

(b) A court of Guam which has made a child-custody determination and does not have exclusive, continuing jurisdiction under this section may modify that determination only if it has jurisdiction to make an initial determination under section 39201.