The story of Jacqueline Kennedy Onassis and her sister, Lee Radziwill's relationship. A life of high fashion and parties masked sibling rivalry and tragedy.
It's 80 years since Amelia Earhart's plane disappeared on her historic round-the-world flight. Hear how her legacy lives on thanks to her beloved sister, 'Pidge'.
Jessica and Diana Mitford were once adoring sisters, but their love for very different men - one a communist, the other Oswald Mosley - led to estrangement.
Elizabeth was a mature child with a love animals and Margaret a mischievous extrovert. How has their relationship shaped the monarchy?
Anne has been celebrated and damned, seen as either schemer or a victim. Her sister Mary is less remembered and often dismissed as a fool. But what was the truth?
Mary was a little-favoured Catholic and Elizabeth a long-reigning, all-admired Protestant. However, Henry VIII's daughters have more in common than meets the eye.
Thousands of women gave their all to the Suffrage movement, but for Christabel and Sylvia their own sisterhood would be strained to the point of breaking.