La Double Famille (A Second Home) is a 1830 novel that belongs to the Scenes from Private Life (Scènes de la Vie Privée) subseries of La Comédie Humaine.
In the novel a widow and her daughter sit sewing by the window most days. A gloomy young man passes by each day in the mornings and returns in the evenings. The mother always remarks that he appears either over-worked or in delicate health. The daughter ignores most of her remarks since the latter sees every passer-by as a possible suitor for the daughter. But soon the gentleman begins to exchange glances with the daughter.
The novel brings two tales to form one whole with exquisite descriptive language, and further investigates the relationship between a normal person and a religious bigot. This is not the only book where Balzac paints a disturbing picture of the excesses of religious fervor.