Benjamin married 1st Clementine (LNAB unknown) Allen.
He married 2nd Zina (Stuart) Lambourne. However, they appear to have divorced at some point, as he is listed as divorced on his death certificate.
Burial: Salt Lake City Cemetery, Salt Lake City, Salt Lake County, Utah, USA, Plot: R_35_16_5W
Sources
"United States Census, 1900," database with images, FamilySearch: accessed 2 April 2016, Benj F Watkins, Precinct 42 Portland city Ward 9, Multnomah, Oregon, United States; citing sheet 3B, family 75, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,350.
"United States Census, 1910," database with images, FamilySearch: accessed 2 April 2016, Benjamin F Watkins in household of Zina A Watkins, Salt Lake City Ward 2, Salt Lake, Utah, United States; citing enumeration district (ED) ED 116, sheet 18B, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,619.
"United States Census, 1920," database with images, FamilySearch: accessed 2 April 2016, Benjaman F Watkins, Salt Lake City Ward 4, Salt Lake, Utah, United States; citing sheet 9A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,821,865.
"Utah Deaths and Burials, 1888-1946," database, FamilySearch: accessed 2 April 2016, Benjamin Franklin Watkins, 17 Jun 1927; citing Salt Lake City, S. L. Co., Utah, reference ; FHL microfilm 26,563.