In 1926 Dawnay married 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.
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In 1862 Louisa, Dowager Marchioness of Waterford (d 1891), widow of the 3rd Marquess, restored and substantially remodelled the Hall.
Ford Castle had been rebuilt in the 1760s and, in 1859, Louisa, Marchioness of Beresford inherited Ford Estate on the death of her husband, the 3rd Marquess (who in turn, had inherited it from his mother, Susanna, Marchioness of Waterford).
In 1842, Lord Waterford married Louisa Stuart, daughter of the 1st Baron Stuart de Rothesay, and settled in Curraghmore House in Ireland, and reportedly led an exemplary life, until he died in a horse riding accident in 1859.
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He was the second son of the 2nd Marquess of Waterford, but became heir apparent to the Marquessate on the death of his elder brother, George Beresford, Earl of Tyrone, in 1824.
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Lord Waterford was a keen horseman and in 1840 he entered two horses in the Grand National Steeplechase, regarded today as the most famous race over jumps in the world.