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They had two sons , Thomas Clifford , 8th Baron de Clifford and Henry , and two daughters , Mary and Blanche ( wife of Robert Waterton , Knight ) .
 Thomas Clifford , 8th Baron de Clifford
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Thomas Clifford , 8th Baron de Clifford