In 1751 he married, morganatically, Maria Johanna Camasse (created Countess Forbach in 1757). They had six children, who were unable to succeed to their father's Duchy due to the morganatic nature of their parents' marriage :
Christian, Count of Forbach, Marquis of Deux-Ponts (1752-1817)
Philipp Guillaume, Count of Forbach, Viscount of Deux-Ponts (1754-1807)