JFK's sister Kathleen Kennedy married English Lord Cavendish in 1944. The Cavendish family, heirs to the Dukedom of Devonshire, presented this heirloom cross to Kathleen. After her tragic death in a airplane crash, JFK gave the cross to Jackie. Crosses One of Jackie's passions was collecting crosses. She eventually had more than 200 crosses in her collection. At least 27 were gifts from JFK.