Section 8(6)(ii) in The Railway Passengers (Cancellation of Ticket and Refund of Fare) Rules, 2015
(ii)In case of party e-ticket or family e-ticket issued for travel of more than one passenger, some passengers have confirmed reservation and others are on the list of RAC or waiting list, then in case of passengers on RAC or waiting list not travelling, a certificate shall be obtained from the ticket checking staff to that effect and refund of fare shall be processed on-line through TDR, indicating the details of the certificate issued by ticket checking staff and the on-line TDR shall be filed upto seventy-two hours of actual arrival of the train at passengers' destination and the original certificate issued by the ticket checking staff shall be sent through post to Indian Railway Catering and Tourism Corporation (IRCTC), and the fare shall be refunded by Indian Railway Catering and Tourism Corporation (IRCTC) to the customer's account after due verification.