Lady Mary Douglas Peerage person ID=131191 (b. 1640) Parents Anne Villiers, Countess of Morton Robert Douglas, 8th Earl of Morton Children Margaret Macdonald Sir Donald Macdonald, 11th of Sleat, 4th Bt. Anne Macdonald William Macdonald Sir James Macdonald, 13th of Sleat, 6th Bt. Barbara Macdonald Isabella Macdonald Siblings Robert Douglas Lady Anne Douglas William Douglas, 9th Earl of Morton Lady Jean Douglas Partners Sir Donald Macdonald, 10th of Sleat, 3rd Bt.