Kathleen Cavendish, Marchioness of Hartington (born 1920)

Kathleen Cavendish, Marchioness of Hartington

American socialite, sister of John F. Kennedy (1920–1948)

Kathleen Agnes Cavendish, Marchioness of Hartington, also known as "Kick" Kennedy, was an American socialite. She was the second daughter of Joseph P. Kennedy Sr. and Rose Fitzgerald, a sister of U.S. President John F. Kennedy and Senators Robert F. Kennedy and Ted Kennedy, and…