Mo. Rev. Stat. § 404.021: Single custodianship — but custodian may serve more than one minor.

A transfer of property under sections 404.005 to 404.094 may be made to only one minor and only one person may be custodian of the property transferred. A person may be a custodian of property for more than one minor, but the custodian shall separately hold and administer the custodial property for each minor.