Lady Isabel Douglas (died 1691) (d. 1691) Parents William Douglas, 1st Marquess of Douglas Lady Mary Gordon Children William Douglas, 1st Earl of March James Douglas, 2nd Duke of Queensberry Lord George Douglas Lady Anne Douglas Siblings Lady Catherine Douglas Lady Lucy Douglas Lady Jean Douglas Lady Margaret Douglas George Douglas, 1st Earl of Dumbarton Lady Grizel Douglas Archibald Douglas, 1st Earl of Ormond Lord James Douglas Lady Jean Douglas Lady Henrietta Douglas Lady Grissell Douglas William Hamilton, 3rd Duke of Hamilton Partners William Douglas, 1st Duke of Queensberry