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He is a great grandson of Sigmund Freud , and son of Annette Krarup and Walter Freud .
 Sigmund Freud, Walter Freud
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sigmund Freud, Walter Freud