California Code, Probate Code - PROB § 16061.9

(a) A trustee who fails to serve the notification by trustee as required by Section 16061.7 on a beneficiary shall be responsible for all damages, attorney's fees, and costs caused by the failure unless the trustee makes a reasonably diligent effort to comply with that section.

(b) A trustee who fails to serve the notification by trustee as required by Section 16061.7 on an heir who is not a beneficiary and whose identity is known to the trustee shall be responsible for all damages caused to the heir by the failure unless the trustee shows that the trustee made a reasonably diligent effort to comply with that section. For purposes of this subdivision, “reasonably diligent effort” means that the trustee has delivered notice pursuant to Section 1215 to the heir at the heir's last address actually known to the trustee.

(c) A trustee, in exercising discretion with respect to the timing and nature of distributions of trust assets, may consider the fact that the period in which a beneficiary or heir could bring an action to contest the trust has not expired.