Mo. Rev. Stat. § 456.3-305: Appointment of representative.

1. If the court determines that an interest is not represented under sections 456.3-301 to 456.3-305 or that the otherwise available representation might be inadequate, the court may appoint a representative to receive notice, give consent, and otherwise represent, bind, and act on behalf of a minor, incapacitated, or unborn individual, or a person whose identity or location is unknown. A representative may be appointed to represent several persons or interests.

2. A representative may act on behalf of the individual represented with respect to any matter arising under sections 456.1-101 to 456.11-1106, whether or not a judicial proceeding concerning the trust is pending.

3. In making decisions, a representative may consider general benefits accruing to the living members of the individual's family.