Lady Margaret Douglas Peerage person ID=20363 (1606–1640) Parents Lady Isabel Kerr William Douglas, 1st Earl of Queensberry Children Lady Mary Johnstone Lady Janet Johnstone Lady Bethia Johnstone Margaret Johnstone James Johnstone, 1st Earl of Annandale and Hartfell William Johnstone Siblings unknown Douglas Sir Archibald Douglas Lady Janet Douglas James Douglas, 2nd Earl of Queensberry William Douglas Partners James Johnstone, 1st Earl of Hartfell