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My Grandpa Marcel ( 1921-2010 ) , holding his great-grandson Isaac. This is what he looked like when he was healthy. http://t.co/qewnXm7I
 Marcel, Isaac.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Marcel, Isaac.