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 Longleg, Lord of Douglas married Marjorie, Countess of Carrick and had by her two sons and a daughter, the daughter inheriting the Earldom of Carrick. Marjorie went on to marry Robert the Bruce, father to King Robert I of Scotland; this, however, does not make any sense historically. William Longleg, Lord of Douglas (died c. 1274) married Constance Battail of Fawdon, and had two sons and a daughter: William Longleg, Lord of Douglas William, Lord of Douglas (c. 1220 – c. 1274), known as 'Longleg', was a Scoto-Norman nobleman. He was the son of Archibald I, Lord of Douglas. The years of the minority