When family man Colin suddenly dies, his wife, Tess, and daughter, Cathy, get an even greater shock: Colin had been hiding a mistress and daughter across town.
Born five days apart, Cat and Cathy disagree about how to celebrate their upcoming birthdays: Cathy wants a quiet night with her fiancé, Marcus, while Cat wants to party.
After a breakdown at work, Cathy is put on compassionate leave and asked to attend grief counseling. Cat wants to be maid of honor and take care of Cathy’s wedding dress.
Cathy boxes up her father’s things in preparation for selling the house, and Cat and Marilyn go overboard taking mementos.
Marilyn and Cat attend Cathy’s bachelorette party. Despite Cathy’s meticulously organized itinerary for the camping trip, things don’t go to plan.
Cathy’s pre-wedding jitters reach a breaking point when Marcus accidentally scuffs a wall in the house. Tess throws a party the night before the wedding.
Marcus has gone on the honeymoon trip that Cathy planned with his secretary. To cheer Cathy up, Cat takes her on their own sisters’ honeymoon on the boat.
Cat and Cathy reel from the news that they have a secret brother - who Cathy just snogged. Marilyn is furious to learn she wasn’t Colin’s only mistress and starts stalking his other lover.
Cat feuds with a rival delivery driver, and Cathy loses a fight with a washbasin at work. Tess’s singles holiday is a disaster, while Angela becomes Marilyn’s house guest from hell.
Cat & Cathy go to an adult maths GCSE class where the sexy teacher causes ructions. Tess takes a job in the worst place possible, and Angela resorts to kidnap 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. Next day, their Dad Colin still has surprises for his family from beyond the grave.
