Indiana Code Title 29. Probate § 29-1-7-18

Sec. 18. (a) When an action is brought to contest the validity of any will as provided in this article, notice is served upon the defendants in the same manner as required by the Indiana Rules of Trial Procedure.

(b) A contesting party shall also serve a copy of the complaint on the counsel of record, if any, for the personal representative.  The court may not enter a default judgment for the contesting party unless proof of service on the counsel for the personal representative is made to the court.