Victor was single in 7/1917, per draft registration records (see below)Mary died between 1920 and 1930.
1930 Cloquet, Carlton County, Minnesota census
Victor Taivanen, roomer, 39, widow, born in Finland, came to the US in 1914.Laborer in a lumber mill.
1920 Cloquet, Carlton County, Minnesota census
Victor Toiwonen, 29, born in Finland, came to the US in 1914. Laborer in a lumber yard.
Mary J (I?), 30, born in Minnesota, both parents born in Finland. Sales lady in a dry goods store.
Edna M, daughter, 7/12, born in Minnesota.
Victor Toivonen and Mary Hongista had a son (unnamed), born in 1917 who died 12/26/1917 in Duluth, St. Louis County, Minnesota source:familysearch.org I don't know if this is your Victor. There were a Victor and Mary Toivonen living in Duluth in 1941.The Victor in Duluth was born in 1885.
Maybe this is Mary...Mrs. Mary Toivanen died 6/8/1923 in St. Louis County, Minnesota. Source: http://people.mnhs.org/dci/Results.cfmhttp://people.mnhs.org/dci/Results.cfm
WWI Draft registration - Carlton County, Minnesota, 7/11/1917
Victor Toivonen, single, born in Hauho,Finland on 7/22/1890. Saw mill laborer. Dependents - parents partially dependent.