Cal. Fam. Code § 4004

In a proceeding where there is at issue the support of a child, the court shall require the parties to reveal whether a party is currently receiving, or intends to apply for, public assistance under the Family Economic Security Act of 1982 (Chapter 2 (commencing with Section 11200) of Part 3 of Division 9 of the Welfare and Institutions Code) for the maintenance of the child.