In case of party Tatkal Ticket or family Tatkal Ticket (for morethan one person) some confimed on others on waiting list, full refund of fairless clerkage shall be granted for the confimed passengers also if the entire Tatkal Ticket is cancelled with in 6hours before the schdule departure of the train and upto 2hours of the actual departure of the train.
source www.scr.indianrailways.gov.in/.../1406548394976-Refund%20Rules.pdf