Gran takes the Brockman family for a day's sightseeing in London. Karen is unimpressed with modern art, Jake suffers serious trauma when he is unable to text, and one of the family uses a visit to HMS Belfast for a brief re-enactment of World War II.

Mum is determined to find out who is responsible after she finds an inappropriate image on the family computer. Dad is scared at the thought of having a heart-to-heart with gran who is still staying with the family. Karen thinks she has won a large amount of money and starts to spend it.

Karen recreates Britain's Got Talent, Ben takes a close interest in Dad's medical tests, Mum thinks Jake's healthy interest in girls is becoming unhealthy, and the ghost of John McEnroe hovers over Dad's Saturday morning game of tennis. Karen decides to sort things out.

Dad is suffering from a terrible hangover, and it seems worse as he struggles against a rising tide of superstition, astrology and conspiracy theories that seem to be taking over the family. Ben takes time off from re-enacting the crusades to show a couple of prospective buyers around the house.

The last time Mum's sister Auntie Angela came to visit, it all ended in disaster. Now she is back to show off the American therapist she has married. Dad is determined to avoid a major incident as they all go out to dinner. Ben tells everyone about his sex education class, Karen puts Auntie Angela's husband straight on therapy, but then there is a bigger problem between Mum and Dad.

Mum and Dad struggle to put things right between them, but Karen is unimpressed by their behaviour. She is worried by her vital role in the school concert, while Ben is busy recreating the assault on Everest on the stairs. But then there is a major panic about one of the children...