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Catherine 'Cathy' Walcott and Catherine 'Cat' Walcott only discovered one another existed after their dad dropped dead. Having finally come to terms with the fact they are sisters, they are now reeling from the news that they also have a brother, Callum - and that Cathy just snogged him. As Cathy struggles with the ethics of fancying a sibling, Cat is determined to welcome Callum to the family, while Callum isn鈥檛 sure what family means any more.

Cat鈥檚 mum, Marilyn, is furious to learn she wasn鈥檛 Colin鈥檚 only mistress and sets about tracking down his other secret lover, Angela, starting a chain of events that nobody expected. Meanwhile, Cathy鈥檚 mum, Tess, decides to have some fun with her late husband鈥檚 legacy and embarks on an ill-advised luxury spending spree.