Question: This British Territorial Army general was succeeded by his son who is estimated to be worth what?
{'answer': 'US$13 billion', 'supporting_facts': [['Gerald Grosvenor, 6th Duke of Westminster', 0], ['Gerald Grosvenor, 6th Duke of Westminster', 3], ['Hugh Grosvenor, 7th Duke of Westminster', 0], ['Hugh Grosvenor, 7th Duke of Westminster', 3]]}