expanded the business with a weaving factory. This enabled the Dreyfus family to live a comfortable and affluent life within Mulhouse society. He spent his first years in a house on Rue du Sauvage, then later in a mansion on Rue de la Sinne, both in Mulhouse.

Due to his mother's bedridden illness following his birth, his sister Henriette became like a second mother to him. Alfred was 10 years old when the Franco-Prussian War broke out in the summer of 1870, and following the annexation of Alsace-Lorraine