What happens when One Direction find out they each have a twin sister that their parents never told them about? What if the only people who knew were the lads parents. The boys decide to bring the girls on tour with them. They find out a bunch of amazing stuff about the girls. The love, the passion, the family moments, the jokes, the pranks. Will they all become one happy family or will this end in a horrible downward spiral? Find out in 1D's Twin Sisters.