The son of Sir William Douglas, fourth baronet; in 1803 he married Lady Caroline Scott, daughter of the third Duke of Buccleuch.

REFERENCES TO Charles Douglas, sixth marquess of Queensberry:

Walter Scott to John Ballantyne, 31 July 1813 in Memoirs of the Life of Sir Walter Scott, Bart. 7 vols (Edinburgh: Robert Cadell, 1837)