Percy Douglas, 10th Marquess of Queensberry English born Scottish noble (1868-1920) (1868–1920) Parents Sibyl, Marchioness of Queensberry John Douglas, 9th Marquess of Queensberry Children Lord Cecil Charles Douglas Lady Dorothy Madeline Douglas Francis Douglas, 11th Marquess of Queensberry Siblings Lord Sholto Douglas Lord Alfred Douglas Francis Douglas, Viscount Drumlanrig Lady Edith Douglas Partners Anna Maria Walters Mary Louise Douglas, Marchioness of Queensberry