Lady Mary Walpole (died 1731) (1705–1731) Parents Catherine, Lady Walpole Robert Walpole Children Robert Cholmondeley unknown son Cholmondeley George Cholmondeley, Viscount Malpas Siblings Edward Walpole Horace Walpole Robert Walpole, 2nd Earl of Orford Katherine Walpole Lady Maria Walpole Partners George Cholmondeley, 3rd Earl of Cholmondeley