Antique dealer Kohout is not a bad person. However, he has an ideal: to be the unlimited master at home. Therefore, he does not see his wife's wishes, nor the fact that his daughter Helena has found a groom, that his other daughter has fallen in love, and that his son is a passionate swimmer. He would like to run their lives according to his old-fashioned ideas. However, Zdenka's suitor, engineer Bečvář, uses a trap to gain Kohout's favor. The antique dealer even offers him Zdenka's hand in marriage. In addition, Kohout's brother, a forester, enters the story, who comes to Prague for a visit. By coincidence, the two brothers switch roles and the family considers their father a dear uncle...