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He was the first son of Henry Davidson ( 1771 – 1827 ) and grandson of Duncan Davidson ( 1733 – 1799 ) , and succeeded to his father 's Scottish estates , including Tulloch Castle .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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