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Kathleen Cavendish, Marchioness of Hartington Biography »
Kathleen Agnes "Kick" Cavendish, Marchioness of Hartington (February 20, 1920 – May 13, 1948), born Kathleen Agnes Kennedy, was the fourth child and second daughter of Joseph P. Kennedy, Sr. and Rose Kennedy. She was a sister of future U.S. President John F. Kennedy and widow of the heir apparent to the Dukedom of Devonshire.