Knox was the son of Philander C. Knox, who served as the U.S. Secretary of State under William Howard Taft and U.S. Attorney General under William McKinley and Theodore Roosevelt.
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In December 1911, Knox was married at New York's Fifth Avenue Presbyterian Church Katherine McCook, the daughter of Anson G. McCook, a member of the "Fighting McCooks," one of the most prolific military families during the American Civil War.
Hugh Masekela | Hugh Jackman | Hugh Grant | Hugh Laurie | Hugh Hefner | Hugh | Fort Knox | Hugh O'Brian | Knox County | John Knox | Hugh Grosvenor, 2nd Duke of Westminster | Knox | Henry Knox | Hugh Percy, 2nd Duke of Northumberland | Hugh Percy, 1st Duke of Northumberland | Hugh Martin | Hugh Dennis | Amanda Knox | Hugh Walpole | Hugh O'Neill, Earl of Tyrone | Hugh de Lacy | St Hugh's College, Oxford | Ronald Knox | Knox County, Tennessee | Knox College | Hugh Wheeler | Hugh Trenchard, 1st Viscount Trenchard | Hugh Trenchard | Hugh Pughe Lloyd | Hugh MacDiarmid |