By his wife, Countess Marie-Helene von Abensperg und Traun (1824-1899), daughter of Count Johann Adam II von Abensperg und Traun (1761-1843) and his wife, Maria Franziska von Mesnil (1787-1865), whom he married in Vienna on 17 September 1846,[3] he had a son, Gaston, who also became a diplomat. The family of Errembault [fr; nl] were established in Veurne in the eleventh century; Gaston's ancestor Louis Errembault [fr] served as president of the Council of Flanders in 1668. His grandson, Gaston Count Errembault de Dudzeele (1877-1961), married Princess Natalija of Montenegro and had issue.