Maryland Code, Estates and Trusts § 14.5-303

(1) A guardian of the property may represent and bind the minor or disabled person;

(2) A guardian of the person may represent and bind the minor or disabled person if a guardian of the property has not been appointed;

(3) An agent having specific authority to act with respect to trust matters may represent and bind the principal;

(4) A trustee of a trust that is a beneficiary of another trust may represent and bind the beneficiaries of the trust that is the beneficiary of the other trust;

(5) A personal representative of the estate of a decedent that is a beneficiary of a trust may represent and bind interested persons in the estate;

(6) A parent may represent and bind the minor, incapacitated, unborn, or unknown child of the parent or child of the parent whose location is unknown and not reasonably ascertainable if a guardian of the property or guardian of the person for the child has not been appointed; and

(7) If a minor, an incapacitated, unborn, or unknown individual or an individual whose location is unknown and not reasonably ascertainable is not otherwise represented under this section, a grandparent or more remote ancestor may represent and bind the individual.