A person interested as or through an executor, administrator, trustee, guardian, receiver, assignee for the benefit of creditors, 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, a minor, a person who is mentally incapacitated, a person who is insolvent, or other person, may have a declaration of rights or legal relations in respect thereto, to:
a. Ascertain any class of creditors, devisees, legatees, heirs, next of kin, or others; or
b. Direct the executor, administrator, trustee, guardian, receiver, assignee for the benefit of creditors, or other fiduciary to do or abstain from doing any particular act in his fiduciary capacity; or
c. Determine any question arising in the administration of the estate, trust, or guardianship, including the construction of wills and other writings.