He was the spouse of Emily Whitten, who was born in the 1880s in Nova Scotia and died in the 1970s in Fitchburg, Massachusetts. Harry was listed as having been 45 at the time of the census or a birth approximately 1895.
The 1940 Census shows Harry Warren and wife Emily O. Warren in Groton Town, Middlesex, Massachusetts, United States.
Based on the above statement about Emily's mother's 82nd birthday who was born in 1863, the party would have been held in 1945, therefore, Harry Warren was still alive.
↑ This is all from a newspaper clipping for her mother's 82nd birthday which notes that the party was "celebrated at the home of her daughter, Mrs. Harry Warren, on Fitch Bridge Road." Fitch's Bridge Road is in Groton.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K4FX-ZGP : 12 December 2019), Harry Warrne, Groton Town, Middlesex, Massachusetts, United States; citing enumeration district (ED) 9-180, sheet 8B, line 79, family 151, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1607.