Matthijs is off to college and takes a room with fellow students Tony & René. But when his room turns out to be a broom closet he wants to move back home. However, his place in his father's house has already been taken by his younger sister Freddy.
Now that Mathijs has moved out and Freddy in, she offers to clean and cook for Norbert. But Mathijs announces he's dropped out of school because of claustrophobia and wants his room back.
Matthijs is living in a tent in the garden but wants to move into the garage. Suus has spent almost all of her inheritance and has bought a house nearby. Matthijs and his pal Sjuul start a lucrative business as wallpaper men. But Norbert panics when the wallpaper turns out to be stolen and Freddy happens to be dating a policeman.
Norbert doesn't want anybody to enter his expensive new kitchen. Matthijs is aiming to win a competition to play the local Sinterklaas. He a gets former Sint, thespian Albert Paardekoper, to coach him.
Matthijs has agreed to be a guinea pig and test a new shampoo, XY2002. But he chickens out at the last minute and tricks his father (and inadvertently his sister) into using the shampoo, just before they go to a fancy diner at the French embassy.
Matthijs & Freddy apply for a summer job at the same restaurant. He as a waiter and she as dishwasher. But Freddy soon manages to climb up to the position of assistant manager. Her first task: to fire her brother.
Norbert is challenged to break a record at his local snooker club, so Matthijs becomes his coach. But things go wrong when Norbert tries a miracle drug from the Amazon rain forest his son has been raving about.
A bus stop has temporarily been placed right in front of the Hogendoorn house. While Norbert tries to get it removed as soon as possible, Matthijs sees it as a quick and easy way to make some money.