Lady Margaret Douglas Peerage person ID=308014 Parents James Douglas, 2nd Earl of Queensberry Lady Margaret Stewart Children Sir John Jardine of Applegirth, 3rd Bt. Siblings Lady Margaret Douglas Lady Henrietta Douglas John Douglas Lady Catherine Douglas William Douglas, 1st Duke of Queensberry Lady Mary Douglas James Douglas Lady Isabel Douglas Robert Douglas Partners Sir Alexander Jardine of Applegirth, 1st Bt.