Louise Marie Madeleine Fontaine
On 9 October 1749 at the Church of Saint-Sulpice, Paris, Jacques-Armand Dupin married with Louise-Alexandrine-Julie de Rochechouart-Pontville. But for Louise and her husband, their son was a source of many troubles, especially when he ran up debts of very large sums of money from gambling. His father had to sell many of his assets in 1750 to honor the debt of his son. The troubles with Jacques-Armand, however, continued. Claude Dupin was forced to obtain against him a "Lettre de cachet", who imprisoned Jacques-Armand in the fortress of Pierre Encise under the pretext of madness. After this, the family decided to send him to the Île Maurice (26 October 1765), where he remained for the next two years until his death on 3 May 1767, a victim of yellow fever. Before embarking on the "Count of Artois", a merchant ship of the French East India Company, Jacques-Armand reportedly revealed to his mother the existence of an illegitimate daughter of his, called Marie-Thérèse Adam, whose origins, however, remained mysterious. Nevertless, Madame Dupin took care of the child and raised as her own, later becoming in her reader and heiress. Louise considers Marie-Thérèse as her own daughter and educated after her own image, transmitting her high culture and elegance of her manners. Marie-Thérèse Adam was entirely dedicated to Madame Dupin and remained at her side until the last moment.
Louise Julie de Mailly
Madame de Mailly remained official mistress, but the king fell in love with Pauline-Félicité and arranged her marriage to the Marquis de Vintimille, enabling her to stay at court, and gave her the castle of Choisy-le-Roi as a gift. Madame de Vintimille quickly became pregnant and died giving birth to the king's illegitimate son, Louis, the duc de Luc, who looked so much like the king that he was called "Demi-Louis" ('Small Louis'). 
Madame de Vintimille's remains lay in "Lit de parade" in the town of Versailles, but during the night a mob broke in and mutilated the body of "the king's whore". The king and Louise Julie were both devastated by the death of Pauline-Félicité and shocked by the mutilation of her body; in her despair she was said to have performed a Catholic rite of penitence by washing the feet of the poor.