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
William Douglas, 2nd Lord Mordington William Douglas, 2nd Lord Mordington William Douglas, 2nd Lord Mordington (27 September 1626 - after 1671) was the eldest son and heir of Sir James Douglas, 1st Lord Mordington (died 1656) by his spouse Anne, daughter of Lawrence Oliphant, 5th Lord Oliphant. In the first parliament of King Charles II in Edinburgh in January 1661, a protest was lodged by Lord Mordington and the Earl of Hartfell on behalf of the young Earl of Angus (who became the 2nd Marquess of Douglas), that his absence (due to being under-age) should not prejudice his hereditary claim to the first vote in