Fiduciary's rights to be construed

Fiduciary's rights to be construed. (a) Any person interested as or through an executor, administrator, 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 or person under legal disability, may have a declaration of rights or other legal relations in respect thereto: (i) To ascertain any class of creditors, devisees, legatees, heirs, next of kin or others; (ii) To direct the executors, administrators or trustees to do or abstain from doing any particular act in their fiduciary capacity; or (iii) To determine any question arising in the administration of the estate or trust, including questions of construction of wills and other writings.