"As complex in their own way as their Mitford cousins, Winston and Clementine Churchill's daughters each had a unique relationship with their famous father. Rachel Trethewey's biography, The Churchill Sisters, tells their story. Bright, attractive and well-connected, in any other family the Churchill girls - Diana, Sarah, Marigold and Mary - would have shone. But they were not in another family, they were Churchills, and neither they nor anyone else...