Maryland Courts and Judicial Proceedings Section 3-408

      Any person interested as or through a personal representative, trustee, guardian or other fiduciary, creditor, devisee, legatee, heir, next of kin, or beneficiary of a trust, in the administration of a trust, or of the estate of a decedent, a minor, disabled person, or insolvent, may have a declaration of rights or legal relations in respect to the trust or the estate of a decedent in order to:

            (1)      Ascertain any class of creditors, devisees, legatees, heirs, next of kin, or others;

            (2)      Direct the personal representative, guardian, or other fiduciary or trustees to do or abstain from doing any particular act in their fiduciary capacity; or

            (3)      Determine any question arising in the administration of the estate or trust, including questions of construction of wills and other writings.