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He was a younger brother of Reginald Grey , 5th Earl of Kent and an older brother of Charles Grey , 7th Earl of Kent .
 Reginald Grey , 5th Earl of Kent, Charles Grey , 7th Earl of Kent
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Reginald Grey , 5th Earl of Kent, Charles Grey , 7th Earl of Kent