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In page Kathleen Cavendish, Marchioness of Hartington:

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Following the German invasion of Poland and the outbreak of World War II in September 1939, Kick, who was staying at the family home in the south of France, had to rush to England with her friend Janey Kenyon Slaney. The Kennedy family, to save Joseph and daughter Rosemary, returned to the United States. Kathleen, having become very fond of England and the many friends she had made during her two years there, petitioned her parents to remain in London despite the coming danger. However, she was overruled by her father, and sailed back home in the early fall of 1939.[citation needed]