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He then spent some years as a private tutor , secretary and librarian , to the family of Lord Wriothesley Russell ( son of John Russell , 6th Duke of Bedford ) and then the Earl Fitzwilliam at Wentworth Woodhouse .
 person: Russell; person: John Russell , 6th Duke of Bedford
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Russell, John Russell , 6th Duke of Bedford 
Answer:
 person: Russell; person: John Russell , 6th Duke of Bedford