ONLY BECAUSE A PERSON HAS LOST A SUCCESSION CERTIFICATE CASE DOES NOT MEAN HE CANNOT FILE ANOTHER CASE TO CLAIM THE SAME MONEY FROM THE PARTY WHO WON, AS SUCCESSION CERTIFICATE DOES NOT DECIDE TITLE TO THE MONEY CLAIM: THAT’S WHAT SUPREME COURT HELD IN “MADHAVI AMMA & ORS. VS KUNJIKUTTI PILLAI”
The Succession Court only has the right to tell the bank/LIC/Post Office, to whom it should give the money in order to get a valid discharge and nothing else. So Z can file a suit tomorrow claiming that he is the brother of Y and hence entitled to money which X received from the bank