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William Thornton came from a slaveholding family based on the island of Tortola , and after he died in 1828 , though his will seemed to grant freedom to his slaves , his wife and mother-in-law continued to reside with slaves in their Washington , D.C. home .
 Thornton, D.C.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Thornton, D.C.