Cat and Cathy reel from the news they have a secret brother-whom Cathy just snogged. Furious she wasn’t Colin’s only mistress, Marilyn starts stalking his other lover.

Cat feuds with a rival driver, and Cathy loses a fight with a washbasin at work. Tess’s singles holiday is a disaster, and Angela becomes Marilyn’s house guest from hell.

Cat and Cathy go to an evening math class, where the sexy teacher causes turmoil. Tess takes a job in the worst place possible, and Angela tries to win back Peter.

Cathy is excited to introduce her siblings to lambing season at Auntie Dawn’s farm, but Tess brings along an unwelcome visitor and Cat brings an unwise gift.

In a bid to heal his rift with Angela, Callum is lured to an eventful Northern Soul Revival. The next day, Colin still has surprises for his family from beyond the grave.