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Gretton was born the son of The Hon. John Gretton , who became the 2nd Baron in 1947 .
 Gretton, The Hon. John Gretton, Baron
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gretton, The Hon. John Gretton, Baron