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His brother , Frank , who went on to become part of the Warner Bros. stock company in the 1930s and 1940s , and sister Kitty performed an act with him by the time he was fourteen years old , but the family quit the stage around 1930 .
 Frank, Warner Bros., Kitty
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Frank, Warner Bros., Kitty