<p>Sir Winston Churchill's paternal grandmother and the mother of Randolph Churchill, the 7th Duchess of Marlborough, has been a slight figure in many other people's biographies yet her own story as a member of a remarkable family has never been fully told, until now.<br>Frances Anne Emily Vane-Tempest-Stewart's family background, as well as her own life, is steeped in great historical names and occasions. She was the eldest daughter of the 3rd M...