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 Alfred Douglas French, and in 1893 he commissioned Douglas to translate it into English. Douglas's French was very poor and his translation was highly criticised; for example, a passage that runs ""On ne doit regarder que dans les miroirs"" ("One should look only in mirrors") he rendered "One must not look at mirrors". Douglas was angered at Wilde's criticism, and claimed that the errors were in fact in Wilde's original play. This led to a hiatus in the relationship and a row between the two men, with angry messages being exchanged and even the involvement of the publisher John Lane and the