Louise Marie Madeleine Fontaine
Jean-Jacques Rousseau subsequently sent an inflamed letter to Madame Dupin, who returns him expressing her concern. This doesn't stop the writer for much and only the intervention of Louise's stepson put an end to his attentions. But Madame Dupin was hardly spiteful and some months after these incidents, takes Rousseau in her service and put him in charge of the education of her son Jacques-Armand for eight days pending for a new tutor. Subsequently, the Dupins taken Jean-Jacques Rousseau as secretary after their return from Venice in 1745, when he is not yet a writer and for a modest salary. His job was to take notes and research for the book projected by Madame Dupin, namely "the defense of women in the 18th century are discussed in minor ... until they died". Madame Dupin stood Rousseau almost to a subordinate or, in the words of Grimm and Marmontel, she gives him leave the day it receives academicians. Jean-Jacques Rousseau feels bitterness after leaving his job as a secretary in 1751, but will always keep good relations with the Dupin family. Madame Dupin provides financial support to his wife, Marie-Thérèse Levasseur, who gave birth to five children abandoned by Rousseau to the Foundling Hospital. As for Louis Claude Dupin, his bound with Rousseau came for their common passion for music. The stepson of Madame Dupin was interested in physics, chemistry and natural history, hoping to integrate the Academy of Sciences and the philosopher did write an unfinished book, popular science to "Institutions of Chemistry".
Jean de Ferrières
Jean de Ferrières, Vidame de Chartres, was the grandson of Jean de Ferrières (died 1497), who had been twice married, firstly to Marguerite de Bourbon (d. before February 1482), illegitimate daughter of John II, Duke of Bourbon (d. April 1488), by whom he had two sons who died without issue, and secondly to Marie de Damas, Dame de Maligny, by whom he had an elder son, Philippe de Ferrières, who inherited the Ferrières lands, and a younger son, François de Ferrières (died 1544), who inherited the Maligny lands, and in 1516 married Louise de Vendôme (d. by 1553), despite the strong opposition of her brother, Louis de Vendôme (d. 22 August 1526). François de Ferrières (died 1544) who was chamberlain to Charles, Duke of Bourbon, and Louise de Vendôme, who was maid of honour to Anne de Beaujeu, Duchess of Bourbon, had two sons and five daughters:In February 1538 Jean de Ferrières was given two benefices by his father. Less than two years later, however, he was disinherited by both his father and mother when they made their joint last wills on 23 December 1539. Although the reason for his disinheritance is unknown, d'Estang suggests that it may have been due to his abandonment of the Catholic religion.