ENQUIRY REGARDING POST OFFICE SAVING ACCOUNT.

MY FATHER HAD A SAVING ACCOUNT AND THREE KVPS' OF 5000 EACH IN THE POST OFFICE ,MY FATHER HAD PASSED AWAY RECENTLY ,THERE IS NO NOMINEE IN THE ACCOUNT OR KVP .WHAT IS THE PROCESS THAT I SHOULD DO NOW SO THAT MY MOTHER WOULD GET THE CLAIM OF THE MONEY.THE MONEY IS APPROXIMATELY 30,000.I ASKED THE POST OFFICE AND THEY TOLD ME TO PREPARE THE SUCCESSION CERTIFICATE,BUT ON INTERNET IT SHOWS THAT SUCCESION CERTIFICATE IS REQUIRED FOR AMOUNT MORE THAN 1,00,000.PLEASE GUIDE ME THAT WHAT SHOULD I DO.