Lady Mary Ker Peerage person ID=26283 (d. 1650) Parents Robert Ker, 1st Earl of Roxburghe Margaret Maitland Children Catherine Carnegie Lady Jean Carnegie Robert Carnegie, 3rd Earl of Southesk Siblings William Ker, Lord Ker Lady Isabella Ker Henry Ker, Lord Ker Lady Jean Ker Partners James Carnegie, 2nd Earl of Southesk Sir James Haliburton of Pitcur