The Decree of the said Court shall not in any Case prejudice any Person, unless such Person has been cited or made a Party to the Proceedings or is the Heir-at-Law or next of Kin, or other Real or Personal Representative of or derives Title under or through a Person so cited or made a Party; nor shall such Sentence or Decree of the Court prejudice any Person if subsequently proved to have been obtained by Fraud or Collusion.