Lady Mary Kerr (1674-1735) (1674–1735) Parents Lady Jean Campbell Robert Kerr, 1st Marquess of Lothian Children Jane Douglas Archibald Douglas, 1st Duke of Douglas William Douglas, Earl of Angus Siblings Lord Charles Kerr Mark Kerr William Kerr, 2nd Marquess of Lothian Partners James Douglas, 2nd Marquess of Douglas