S.C. Code Ann. § 15-53-50: Rights under trust or estate of decedent, infant, lunatic or insolvent.

Any person interested as or through an executor, administrator, trustee, guardian or other fiduciary, creditor, devisee, legatee, heir, next of kin or cestui que trust in the administration of a trust or of the estate of a decedent, infant, lunatic or insolvent 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;

(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.