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He was one of two siblings ; his sister Ethel Marian " Maie " Sumner would later marry Richard Casey .
 Ethel Marian " Maie " Sumner, Richard Casey
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ethel Marian " Maie " Sumner, Richard Casey