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
George Douglas, 4th Lord Mordington George Douglas, 4th Lord Mordington George Douglas, 4th Lord Mordington, died 10 June 1741 at Covent Garden, London, was the son and heir of James Douglas, 3rd Lord Mordington by his wife Anne, daughter of Alexander Seton, 1st Viscount of Kingston. George, Lord Mordington, is described by several authorities as a political writer. He obtained a prominent mention in Walpole's "Royal and Noble Authors" (Parks edition, vol.v, p. 147) as the author of a work called "The Great Blessing of a Monarchical Government" - "when fenced about with and bounded by the laws, and these laws secured and observed by