If it was a normal partial waitlisted E ticket, if you cancel the entire PNR before 6 hours before actual departure , 25 % of the fare will be deducted as cancellation charge for the CNF passenger and 30 rs as clerkage charge for other two WL passengers.
If TDR filed after charting, you will get full refund after deducting the clerkage charges for all passengers, but it will take time.
Here it not possible as it is CK .