sentences:  In 1926 Dawnay married his cousin Lady Katharine Nora de la Poer Beresford, daughter of Henry de la Poer Beresford, 6th Marquess of Waterford and Lady Beatrix Frances Petty-FitzMaurice; they had two daughters and two sons.His son Major Hugh Dawnay was a well known polo player and respected coach whose son, Sebastian Dawnay, is also a professional polo player.Hugh's twin, Peter, married Caroline, daughter of Group Captain Nicolas Tindal-Carill-Worsley.