Father Rinus and son Harry both work at the same police-station. Because of renovations, Rinus has to temporarily move into with this son. But Harry would rather see his father rent a room with his mother-in-law Florrie.
Rinus is moving in with Harry and Thea at Hortensialaan 14, but Harry objects to his father bringing along his electric organ. During their argument, a used goods collector takes away the instrument.
With three breadwinners in the Dageraad Household, each one expects one of the others to do the shopping. Florrie unexpectedly gives Rinus a deep freezer, supposedly for his birthday.
Rinus and Harry bet each other that Rinus can't go without smoking for a month and Harry can't go without eating sweets. That same night, Harry, while on patrol, sees his father exiting a club with a big cigar.
Florrie has to have a minor operation, so her dog Fifi is staying with Harry, Thea and Rinus. But Harry has also brought a pet home: a stray cat from the office.
Harry's stray cat brought fleas into the police office last week, and now they are everywhere, even in Florrie's new wig. Rinus invites Chief Ab around just like old times.