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She is also the daughter of suspense writer Mary Higgins Clark , with whom she has co-authored several Christmas novels , and the former sister-in-law of author Mary Jane Clark .
 Mary Higgins Clark, Mary Jane Clark
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mary Higgins Clark, Mary Jane Clark