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The 7th Duke of Westminster, Hugh Grosvenor, inherited his title in 2016. He became the wealthiest person in the United Kingdom under the age of 30, with an estimated net worth of £9.3 billion. The Grosvenor family has held the title of Duke of Westminster since 1874 and is known for its extensive property holdings in London, including the Grosvenor Square and Mayfair areas.