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When Catharine Hamilton speaks French that she’s picked up over the years, it jangles with a strong Texas twang.
But that hasn’t prevented the former interior designer and her husband, Houston-raised, Chicago-based businessman David Hamilton, from immersing themselves in all things French. Their 10,000-square-foot duplex apartment on Chicago’s Lake Shore Drive brims with 18th-century French paneling and period furniture. Their four-bedroom Paris apartment overlooks the Champs Élysées and the Eiffel Tower. And King Henry…