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Two of his sons John Henderson ( 1860-1924 ) and J. Morris Henderson also known as Joseph Morris Henderson RSA ( 1863-1936 ) also became painters in their own right .
 Henderson, Henderson, Joseph, Henderson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Henderson, Henderson, Joseph, Henderson