Section 299.2.

Cal. Family Code - FAM § 299.2.
in effect
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A legal union of two persons, other than a marriage, that was validly formed in another jurisdiction, and that is substantially equivalent to a domestic partnership as defined in this part, shall be recognized as a valid domestic partnership in this state regardless of whether it bears the name domestic partnership.
Source: CA Legislative Counsel Bulk DataURL: https://downloads.leginfo.legislature.ca.gov/pubinfo_2025.zipFetched: 6/27/2026

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