Any person interested as or through a personal representative, trustee, guardian, conservator, or other fiduciary, creditor, devisee, heir, next of kin, or cestui que trust, in the administration of a trust, or of the estate of a decedent, an infant, a mentally ill or deficient person, or an insolvent, may have a declaration of rights or legal relations in respect thereto:
N.D.C.C. § 32-23-04