 His father later remarried and so the 2nd Duke of Berwick had 12 younger half brothers and half sisters, the eldest half brother being the origin of the line of French Dukes of Fitzjames (a title extinguished in 1967).On 31 December 1716, the 2nd Duke of Berwick became the second husband of the dowager Catalina Ventura Colón de Portugal y Ayala-Toledo, 9th Duchess of Veragua (14 July 1690 – 3 October 1739).Catalina Ventura was the daughter of Pedro Manuel Colon de Portugal y de la Cueva, (25 December 1651 - 9 September 1710).