Probate Code § 5407

If a financial institution is required or permitted to make payment pursuant to this chapter to a person who is a minor:

(a) If the minor is a party to a multiple-party account, payment may be made to the minor or to the minor’s order, and payment so made is a valid release and discharge of the financial institution, but this subdivision does not apply if the account is to be paid to the minor because the minor was designated as a P.O. D. payee or as a beneficiary of a Totten trust account.

(b) In cases where subdivision (a) does not apply, payment shall be made pursuant to the California Uniform Transfers to Minors Act (Part 9 (commencing with Section 3900) of Division 4), or as provided in Chapter 2 (commencing with Section 3400) of Part 8 of Division 4.