Mo. Rev. Stat. § 362.1075: Fiduciary capacity — oath, affirmation, affidavit, or acknowledgment.

If a family trust company is required to make an oath, affirmation, affidavit, or acknowledgment regarding a fiduciary capacity in which the family trust company is acting or preparing to act, a director, officer, or if the company is a limited liability company, a manager or officer expressly authorized by the family trust company shall make and if required, subscribe to such oath, affirmation, affidavit, or acknowledgment on behalf of the company.