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 William Douglas had three sons, the second of which, Walter, went on to continue the Douglases of Grangemuir. In May 1837, some time after William Douglas's eldest brother succeeded to the Marquessate of Queensberry, he was granted a patent of precedence which gave him the rank and style of a Marquess's younger son ("Lord" William Douglas). Lord William is buried at Dunino, Fife, a village close to his family seat at Grangemuir, near Pittenweem. Lord William Douglas Lord William Robert Keith Douglas (1783 – 5 December 1859) was a British politician and landowner. He was the fourth son of Sir William Douglas,