Sarah Spencer with her future brother-in-law, Prince Charles, at a polo match, July 1977. She is the older sister of Diana, the future Princess of Wales. (Photo by Serge Lemoine/Getty Images)
Sarah Spencer with her future brother-in-law, Prince Charles, at a polo match, July 1977. She is the older sister of Diana, the future Princess of Wales. (Photo by Serge Lemoine/Getty Images)