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In page Kathleen Cavendish, Marchioness of Hartington:

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In 1943, seeking a way to return to England, Kathleen signed up to work in a center for servicemen set up by the Red Cross. During her time in England, both before and particularly during the war, she grew increasingly more independent from her family and the Roman Catholic Church to which they belonged. During this time, Kennedy began a romantic relationship with politician William Cavendish, Marquess of Hartington (usually known to his family and friends as Billy Hartington). He was the eldest son and heir apparent of the 10th Duke of Devonshire.[citation needed]