Cal. Probate Code § 5405

(a) Payment made pursuant to Section 5401, 5402, 5403, or 5404 discharges the financial institution from all claims for amounts so paid whether or not the payment is consistent with the beneficial ownership of the account as between parties, P.O.D. payees, or beneficiaries, or their successors. (b) The protection provided by subdivision (a) does not extend to payments made after the financial institution has been served with a court order restraining payment. No other notice or any other information shown to have been available to a financial institution shall affect its right to the protection provided by subdivision (a). (c) Unless the notice is withdrawn by a subsequent writing, after receipt of a written notice from any party that withdrawals in accordance with the terms of the account, other than a checking account, share draft account, or other similar third-party payment instrument, should not be permitted, except with the signatures of more than one of the parties during their lifetimes or of more than one of the survivors after the death of any one of the parties, the financial institution may only pay the sums on deposit in accordance with the written instructions pending determination of the rights of the parties or their successors. No liability shall attach to the financial institution for complying with the terms of any written notice provided pursuant to this subdivision. (d) The protection provided by this section has no bearing on the rights of parties in disputes between themselves or their successors concerning the beneficial ownership of funds in, or withdrawn from, multiple-party accounts and is in addition to, and not exclusive of, any protection provided the financial institution by any other provision of law.