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
James Douglas, 3rd Lord Mordington James Douglas, 3rd Lord Mordington James Douglas, 3rd Lord Mordington (born 1651), succeeded his father William Douglas, 2nd Lord Mordington, It is recorded in "The Great Seal of Scotland" (charter number 294) confirmed at Edinburgh on 2 August 1662, that James Douglas, Master of Mordington, eldest son of William Douglas, 2nd Lord Mordington, acquired the estates of Nether Mordington, as well as Edrington and its castle, which occupied the lower half of the parish. In the National Archives of Scotland (GD206/6/20) are Legal papers relative to the 20 merklands of Over and Nether Mordington in parish of Mordington, regality of