[PAR] [TLE] William Cavendish, Marquess of Hartington [SEP] Major William John Robert "Billy" Cavendish, Marquess of Hartington (10 December 1917 – 9 September 1944) was an English politician and soldier.  He was the elder son of Edward Cavendish, 10th Duke of Devonshire, and his wife, Lady Mary Gascoyne-Cecil.  He was the husband of Kathleen Kennedy, sister of the future U.S. President John F. Kennedy. [PAR] [TLE] Kathleen Cavendish, Marchioness of Hartington [SEP] Kathleen Agnes Cavendish, Marchioness of Hartington ("née" Kennedy; February 20, 1920 – May 13, 1948), also known as "Kick" Kennedy, was an American socialite.  She was the daughter of Joseph P. Kennedy, Sr. and Rose Kennedy, sister of future U.S. President John F. Kennedy, and wife of the Marquess of Hartington, heir apparent to the 10th Duke of Devonshire.
[PAR] [TLE] William Cavendish , Marquess of Hartington [ SEP ] Major William John Robert " Billy " Cavendish , Marquess of Hartington ( 10 December 1917 – 9 September 1944 ) was an English politician and soldier . He was the elder son of Edward Cavendish , 10th Duke of Devonshire , and his wife , Lady Mary Gascoyne - Cecil . He was the husband of Kathleen Kennedy , sister of the future U.S. President John F. Kennedy . [PAR] [TLE] Kathleen Cavendish , Marchioness of Hartington [ SEP ] Kathleen Agnes Cavendish , Marchioness of Hartington ( " née " Kennedy ; February 20 , 1920 – May 13 , 1948 ) , also known as " Kick " Kennedy , was an American socialite . She was the daughter of Joseph P. Kennedy , Sr . and Rose Kennedy , sister of future U.S. President John F. Kennedy , and wife of the Marquess of Hartington , heir apparent to the 10th Duke of Devonshire .
The husband of Kathleen Kennedy was heir apparent to the 10th Duke of where?
The husband of Kathleen Kennedy was heir apparent to the 10th Duke of where ?
Devonshire
Devonshire