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In page Kathleen Cavendish, Marchioness of Hartington:

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As a child, Kennedy was very athletic and played football with her brothers. An account cited that this stemmed from the ethos of competition that her father instilled on the young children. They were split into teams and would compete in sports at the family compound in Hyannis Port, Massachusetts.[3] Her optimism and high spirits attracted many suitors, some of whom were Jack's closest friends. Eventually Kennedy started to date and had her first serious relationship with W. R. Grace and Company heir J. Peter Grace.[citation needed]