In 1818, he married Lady Charlotte Georgiana Cholmondeley, daughter of George Cholmondeley, 1st Marquess of Cholmondeley. They had one son:
1. Hugh Horatio Seymour (1821–1892), married Georgiana, daughter of Gen. Robert Ellice, in 1846 and had two children: 1. Hugh Francis Seymour (1855–1930), barrister, married Rachel Blanche Lascelles, daughter of Hon. Rev. James Walter Lascelles and granddaughter of Henry Lascelles, 3rd Earl of Harewood, and had issue, including Horace James Seymour. 2. Charlotte Susan Seymour (d. 1948), married Charles Walter Campion (1839–1926) in 1879.
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Featured National Park champion connections: Hugh is 14 degrees from Theodore Roosevelt, 17 degrees from Stephanus Johannes Paulus Kruger, 14 degrees from George Catlin, 15 degrees from Marjory Douglas, 22 degrees from Sueko Embrey, 14 degrees from George Grinnell, 17 degrees from Anton Kröller, 14 degrees from Stephen Mather, 17 degrees from Kara McKean, 18 degrees from John Muir, 5 degrees from Victoria Hanover and 22 degrees from Charles Young on our single family tree. Login to find your connection.