 His mother was the first wife of Jean Baptiste Colbert, Marquis of Seignelay and as such, Charles Louis had four half siblings.Through his mother, he was a first cousin of Jacques I, Prince of Monaco, the spouse of Louise Hippolyte, Princess of Monaco He was also the Prince of Mortagne.He married Élisabeth de Roquelaure, a daughter of Antoine Gaston de Roquelaure.