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Section 3423 Of Chapter 2. Jurisdiction From California Family Law Code >> Division 8. >> Part 3. >> Chapter 2.

3423
. Except as otherwise provided in Section 3424, 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 paragraph (1) or (2) of subdivision (a) of Section 3421 and either of the following determinations is made:
  (a) The court of the other state determines it no longer has exclusive, continuing jurisdiction under Section 3422 or that a court of this state would be a more convenient forum under Section 3427.
  (b) 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.