Lady Isabel Douglas Peerage person ID=207588 (b. 1655) Parents James Douglas, 2nd Earl of Queensberry Lady Margaret Stewart Children Sir James Lockhart, 2nd Bt. Isobel Lockhart Siblings Lady Margaret Douglas Lady Henrietta Douglas John Douglas Lady Margaret Douglas Lady Catherine Douglas William Douglas, 1st Duke of Queensberry Lady Mary Douglas James Douglas Robert Douglas Partners Sir William Lockhart of Carstairs, 1st Bt.