Herminie and Fanny Pereire were sisters-in-law, married to the eminent Jewish bankers and Saint-Simonian socialists Emile and Isaac. They were also mother and daughter. This book, a companion to the author's acclaimed Emile and Isaac Pereire (2015), sheds new light on elite Jewish families in nineteenth-century France. Drawing on the family archives, it traces the Pereires across a century of major social and political change, from the Napoleonic period to the cusp of the First World War, revealing the active role they played as bourgeois women both within and outside the family. It offers insights into Jewish assimilation, embourgeoisement and gender relations, through the lens of one of the most fascinating families of the century.