California Code, Probate Code - PROB § 16503

(a) A beneficiary may object to the proposed action by delivering a written objection pursuant to Section 1215 to the trustee at the address stated in the notice of proposed action within the time period specified in the notice of proposed action.

(b) A trustee is not liable to a beneficiary for an action regarding a matter governed by this part if the trustee does not receive a written objection to the proposed action from a beneficiary within the applicable period and the other requirements of this section are satisfied. If no beneficiary entitled to notice objects under this section, the trustee is not liable to any current or future beneficiary with respect to the proposed action. This subdivision does not apply to a person who is a minor or an incompetent adult at the time of receiving the notice of proposed action unless the notice is served on a guardian or conservator of the estate of the person.

(c) If the trustee receives a written objection within the applicable period, either the trustee or a beneficiary may petition the court to have the proposed action taken as proposed, taken with modifications, or denied. In the proceeding, a beneficiary objecting to the proposed action has the burden of proving that the trustee's proposed action should not be taken. A beneficiary who has not objected is not estopped from opposing the proposed action in the proceeding.

(d) If the trustee decides not to implement the proposed action, the trustee shall notify the beneficiaries of the decision not to take the action and the reasons for the decision, and the trustee's decision not to implement the proposed action does not itself give rise to liability to any current or future beneficiary. A beneficiary may petition the court to have the action taken, and has the burden of proving that it should be taken.