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They had two children ; Sarah Margaret Gretton ( born 1971 ) and John Lysander Gretton , who would later succeed his father as 4th Baron .
 Gretton, John Lysander 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, John Lysander Gretton, Baron