633.320  Declaratory judgment to determine last will.
  The executor or any person named as a beneficiary in a will may bring an action for a declaratory judgment to have such will declared to be the last will of the decedent. In such action, all known interested persons, including heirs of the decedent and persons named as beneficiaries in said instrument and other known instruments purporting to be wills of the decedent, shall be joined as parties.
[C66, 71, 73, 75, 77, 79, 81, §633.320]