California Code
ARTICLE 3 - Lawyer-Client Privilege
Section 957.

957. There is no privilege under this article as to a communication relevant to an issue between parties all of whom claim through a deceased client, regardless of whether the claims are by testate or intestate succession, nonprobate transfer, or inter vivos transaction.

(Amended by Stats. 2009, Ch. 8, Sec. 2. (AB 1163) Effective January 1, 2010.)