308775
Full details of their family are not published , but they had at least one son , Richard , born 1936 or 1937 , who also took up photography and has latterly acted as custodian of his father 's collection .
 None
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:  
Answer:
 None