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He is the elder brother of naturalist and broadcaster David Attenborough and John Attenborough , who was an executive at Alfa Romeo before his death in 2012 .
 David Attenborough, John Attenborough, Alfa Romeo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 David Attenborough, John Attenborough, Alfa Romeo