The Björcks are an ordinary middle-class family in a large Stockholm apartment with with two children, Greta and Ville. But the family's happiness is threatened in two ways: Greta prefers Börje Schack instead of the well-behaving Bertil. And the flirtatious Mrs. Holten tries to snare Mr. Björck.
The aristocratic count Hägerskiöld is very proud of his swine Helen of Troy who wins a prize every year as the best swine in the area. This year his son Claes-Ferdinand needs money to get married with Pyret, a chorus-girl. His father won't give him any so he steals the swine, expecting that his father will give a reward to anyone who can find her.
Mr. Vinner comes home tired, finds a coffee brewing and a house full of rowdy kids - "other people's and his own" - in the nursery. In the corner of a room, he dozes off and has a highly instructive Stone Age dream, from which he wakes up as an "ideal husband."