On 5 May 1927 he married firstly, at Kimbolton Castle, Huntingdonshire, Nell Vere Stead (died 2 September 1966), daughter of Sydney Vere Stead of Melbourne, Australia, by whom he had two sons.
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During the 1950s the Duke sold both the family seat, Kimbolton Castle, along with most of its contents, and Tandragee Castle.
The castle was used by the Royal Army Medical Corps during World War II, and the 10th Duke of Manchester sold the castle to Kimbolton School in 1950.
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#Lady Louisa Augusta Beatrice Montagu (Kimbolton Castle, 17 January 1856 – London, 3 March 1944), married London, 10 August 1876 Archibald Acheson, 4th Earl of Gosford and had issue.
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#Lady Mary Louisa Elizabeth Montagu (Kimbolton Castle, 27 December 1854 – 10 February 1934), married firstly at Kimbolton Castle, 10 December 1873 William Douglas-Hamilton, 12th Duke of Hamilton and had issue, and secondly 20 July 1897 to Robert Carnaby Forster of Easton Park, Wickham Market, Suffolk (d. 23 June 1925), without issue.