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The couple had two children ( both born by Caesarean section at Margaret 's request ) : David , born 3 November 1961 , and Sarah , born 1 May 1964 .
 Margaret, David, Sarah
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Margaret, David, Sarah