Lord Francis Douglas Marquess of Queensberry; a younger brother, Lord Archibald Edward Douglas (1850–1938), who became a clergyman; and a younger brother and sister, the twins Lord James Douglas (d. 1891) and Lady Florence Douglas (1855–1905), who married Sir Alexander Beaumont Churchill Dixie, 11th Baronet. He was an uncle of Oscar Wilde's lover Lord Alfred Douglas, and a younger brother of John Douglas, 9th Marquess of Queensberry. In 1858, Douglas's father, Lord Queensberry, died in what was reported as a shooting accident, but his death was widely believed to have been suicide. In 1862, his mother, Lady Queensberry, converted to Roman Catholicism and
Lord Alfred Douglas between him and his father. Their relationship had always been a strained one and during the Queensberry-Wilde feud, Douglas sided with Wilde, even encouraging Wilde to prosecute the Marquess for libel. In 1893, Douglas had a brief affair with George Ives. In 1858 his grandfather, the 8th Marquess of Queensberry, had died in what was reported as a shooting accident, but was widely believed to have been suicide. In 1862, his widowed grandmother, Lady Queensberry, converted to Roman Catholicism and took her children to live in Paris. One of his uncles, Lord James Douglas, was deeply attached to his twin