Any person interested as or through an executor, administrator, trustee, guardian, fiduciary, adviser, or protector under § 3313(a) of this title, designated representative under § 3339 of this title, creditor, devisee, legatee, heir, next-of kin or cestui que trust, in the administration of a trust, or the administration of the estate of a decedent, an infant, or a person with a mental condition, may have a declaration of rights or legal relations in respect thereto:
(1) To ascertain any class of creditors, devisees, legatees, heirs, next-of-kin or others; or
(2) To direct the executors, administrators or trustees to do or abstain from doing any particular act in their fiduciary capacity; or
(3) To determine any question arising in the administration of the estate or trust, including questions of construction of wills and other writings.