Juste-Charles de Faÿ de la Tour-Maubourg (1774 – 1846) married Anastasie de La Fayette (1777–1863), the daughter of marquis de Lafayette, and Adrienne de La Fayette.
They had three daughters. The second, Jenny, married General Ettore Perrone di San Martino, famous politician of the Kingdom of Piedmont. Among their descendants is the present Queen Paola of Belgium. His father was Claude Florimond de Faÿ (1712 – 1790), and his mother was Marie Françoise de Vachon de Belmont (b.1712).
He was captured at Rochefort, Belgium, with his brothers, and Lafayette, and imprisoned by the Austrians, but was soon released. He lived in exile until the release of his brother. After the Lafayettes release from Olmutz, he married Anastasie de la Fayette (1777–1863), at Madame de Tessé's Witmold, on 9 May 1798.
He rebuilt the family castle, le Château des Mayeux, destroyed under the Revolution by a fire.
He became mayor of La Chapelle-Rablais in 1830, and owned le Château des Mayeux until 1846.
His brother, Marie Victor de Fay, marquis de Latour-Maubourg, was a Cavalry Corps commander, survived the Russian Campaign, and was wounded at the battle of Leipzig.
His older brother, Charles César de Fay de La Tour-Maubourg (b. 11 February 1757 – 28 May 1831) was also captured at Rochefort, Belgium, and imprisoned with Lafayette in Olmutz prison until September 1797. He married Charlotte, daughter of Charles Pinault de Thénelles, (d. 18 June 1837). They had six children:
He married Anastasie de la Fayette (1777–1863), on 9 May 1798. She followed her mother Adrienne de La Fayette to Olmutz prison; she copied her letters from prison. After 1848 she lived in Turin with her daughter.