On 14 May 1788, he married his second cousin (their great-grandfather was Anne-Jacques de Bullion, marquis de Fervacques, Governor of Marne),www.bnf.fr Bonne-Charlotte-Renée-Adélaïde de Montmorency-Luxembourg (1773–1840), daughter of Anne-Charles-Sigismond, duc de Piney-Luxembourg (1737–1803) and head of the senior branch of the Montmorencys, by his wife Madeleine-Suzanne-Adélaïde de Voyer de Paulmy d'Argenson.
