Guess you were mentioning your Grandfather missed the train from CSTM Dep 2:00 PM and you filled TDR @ 3:34 PM,that passenger didn't travel...You are subject to get 50% Refund.
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Supporting Rule:
(iii) if the ticket is presented for cancellation within six hours instead of existing 4 hours before the scheduled departure of the train and upto two hours irrespective of distance instead...
more... of existing 3/6/12 hours for distance 200 kms/200-500 kms/500 Kms and above after the actual departure of the train, the cancellation charge shall be fifty per cent of the fare subject to a minimum of the cancellation charge.