Marcello, the scion of a noble and rich family, is morbidly obsessed with his mother, Countess Elisabetta di Tarcento. When she dies, things go haywire as people around him reveal their true identity and he gets a new motherly companion.

After realizing their babies were exchanged at birth, two women develop a plan to adjust to their new lives: creating a single —and peculiar— family.

Abby McClure, a widow with three sons, and Jake Iverson, a widower with a teenage daughter, begin dating and eventually decide to get married. But they're not prepared for the hostile reactions from their children, who are not very excited about the new union between the two families.

An inventor and his mom hit the road together so he can sell his latest invention.

Mutter Krause, her daughter Erna and her son Paul live in a tenement in the poorer section of Berlin's Wedding district. Along with them lives "the Tenant", his soon-to-be bride Friede, who works as a prostitute, and her child whose name isn't revealed in the film. Mutter Krause is a quiet, long-suffering old woman who earns what little she can delivering newspapers. However, Paul is an alcoholic and spends all her money on drink. Mutter Krause can't pay back the money she owes the man whose newspapers she delivered and he accuses her of stealing and threatens her with arrest. Mutter Krause must then pawn her last valuable possession, a treasured memento of her late husband. Paul then breaks into the same pawn shop. He gets away but is later arrested. Meanwhile, Erna begins dating a young man with Communist views, who turns Erna to Communism and also helps her earn the money her mother needs by more honest means.

After a worker kills a superior and commits suicide, each of his family members attempts to forge a path forward in life.