527.040. Any person interested as or through a personalrepresentative, trustee, guardian or other fiduciary, creditor,devisee, legatee, heir, next of kin, or cestui que trust, in theadministration of a trust, or of the estate of a decedent, aninfant, mentally incapacitated person, or insolvent may have adeclaration 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 personal representatives or trustees to door abstain from doing any particular act in their fiduciarycapacity; or
(3) To determine any question arising in the administrationof the estate or trust, including questions of construction ofwills and other writings.
(RSMo 1939 ยง 1129, A.L. 1983 S.B. 44 & 45)