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In 1860 he married Harriet , daughter of Andrew Wauchope of Niddrie Marischal ; they had five sons and four daughters , including Maud Helen who married John Gretton , 2nd Baron Gretton and had issue .
 person: John Gretton , 2nd Baron Gretton
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: John Gretton , 2nd Baron Gretton 
Answer:
 person: John Gretton , 2nd Baron Gretton