Lady Margaret Hay (1657-1753) (1657–1753) Parents Lady Jane Scott John Hay, 1st Marquess of Tweeddale Children Robert Ker, 4th Earl of Roxburghe William Kerr John Ker, 1st Duke of Roxburghe Siblings Lord Alexander Hay Lord David Hay John Hay, 2nd Marquess of Tweeddale Lady Jane Hay Partners Robert Ker, 3rd Earl of Roxburghe