Episode 5: Cat and Cathy and their moms try to get Callum to heal his rift with Angela. They lure Callum to the Northern Soul Revival, where Cathy and Marcus's relationship is tested again, and Tess comes to the rescue in a life-or-death situation. The next day, the siblings' DNA results bring more surprises, but none so big as what Colin has in store for them on the first anniversary of his sudden death.