California Code, Financial Code - FIN § 1607

Whenever an executor, administrator, guardian or conservator of estates, assignee, receiver, depositary, or trustee is required to qualify by taking and subscribing an oath or to make an affidavit, any trust company acting in any such capacity may satisfy such requirement by the oath or affidavit of its president, vice president, secretary, assistant secretary, manager, trust officer, or assistant trust officer. Any such trust company shall be liable for its failure to perform any of the duties required by law to be performed by an individual acting in like capacity and shall be subject to the same penalties for such failure as would be applicable to an individual.