Cal. PROB § 2586

(a) As used in this section, “estate plan of the conservatee” includes, but is not limited to, the conservatee’s will, any trust of which the conservatee is the settlor or beneficiary, any power of appointment created by or exercisable by the conservatee, and any contract, transfer, or joint ownership arrangement with provisions for payment or transfer of benefits or interests at the conservatee’s death to another or others which the conservatee may have originated.

(b) Notwithstanding Article 3 (commencing with Section 950) of Chapter 4 of Division 8 of the Evidence Code (lawyer-client privilege), the court, in its discretion, may order that any person having possession of any document constituting all or part of the estate plan of the conservatee shall deliver the document to the court for examination by the court, and, in the discretion of the court, by the attorneys for the persons who have appeared in the proceedings under this article, in connection with the petition filed under this article.

(c) Unless the court otherwise orders, no person who examines any document produced pursuant to an order under this section shall disclose the contents of the document to any other person. If that disclosure is made, the court may adjudge the person making the disclosure to be in contempt of court.

(d) For good cause, the court may order that a document constituting all or part of the estate plan of the conservatee, whether or not produced pursuant to an order under this section, shall be delivered for safekeeping to the custodian designated by the court. The court may impose those conditions it determines are appropriate for holding and safeguarding the document. The court may authorize the conservator to take any action a depositor may take under Part 15 (commencing with Section 700) of Division 2.