Any person interested as or through an executor, administrator, trustee, guardian, conservator or other fiduciary, creditor, devisee, legatee, heir, next of kin or cestui que trust, in the administration of a trust or the estate of a decedent, insolvent, an infant or other person for whom a guardian, or conservator has been appointed, may obtain a declaration of rights or legal relations for any of the following reasons:
Iowa. R. Civ. P. 1.1104