Family Code section 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.

Source: Section 3423, https://leginfo.­legislature.­ca.­gov/faces/codes_displaySection.­xhtml?lawCode=FAM§ionNum=3423.­ (updated Jan. 1, 2000; accessed Jun. 25, 2025).

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Verified:
Jun. 25, 2025

§ 3423's source at ca​.gov