I was not able to locate any marriage books in the sparse selection of Massachusetts reference books in my library. I have found on Ancestry.com the World War 1 registration card for Raymond Young Urquhart. He lists his birthday as August 12, 1896 and his address as 1 Highland Park, Cambridge. He says he was born in Brighton, Mass, his father was born in New Brunswick, Canada and his nearest relative is M. Lillian Urquhart. I found him in the 1930 census (last name "Weinhart" in Ancestry.com's index) in Cambridge City ward 7. He is a lodger, single and a lawyer. Looks like all John's children, except for Dorothy, are unmarried in 1930. Don't forget to update your posting if you locate any more info. Best regards.