 In 1804 at Utrecht, Colonel de Faÿ married Pétronille van Rijssel ("later styled" marquise de La Tour-Maubourg), who predeceased him on 17 July 1844.His elder brother, Charles-César de Faÿ de La Tour-Maubourg was also a French Army general, and his younger brother, Juste-Charles de Faÿ de La Tour-Maubourg was married to Anastasie de La Fayette (1777–1863).At the end of 1799 de Faÿ returned to France and was posted to Egypt by the First Consul.