Any person interested as or through a personal representative, administrator, 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, ward, or insolvent, may have a declaration of rights or legal relations in respect to any of the following:
A.R.S. § 12-1834