Cal. Evidence Code - EVID § 1330. Section 1330.
Evidence of a statement contained in a deed of conveyance or a will or other writing purporting to affect an interest in real or personal property is not made inadmissible by the hearsay rule if:
(a)
The matter stated was relevant to the purpose of the writing;
(b)
The matter stated would be relevant to an issue as to an interest in the property; and
(c)
The dealings with the property since the statement was made have not been inconsistent with the truth of the statement.