[F1CounterclaimE+W
57.8—(1) A defendant who contends that he has any claim or is entitled to any remedy relating to the grant of probate of the will, or letters of administration of the estate, of the deceased person must serve a counterclaim making that contention.
(2) If the claimant fails to serve particulars of claim within the time allowed, the defendant may, with the permission of the court, serve a counterclaim and the probate claim shall then proceed as if the counterclaim were the particulars of claim.]