Donna, this may be your Franciscus (Frank) and later his widow, Martha:
1910 Baker School Township, Emmons Co., ND: Frank Schlosser, age 23, b. Russ. Lithuania, single, farm laborer in household of Anton Baumgartner, language spoken German
Nearby is an Anton Schlosser, age 64, b. Russia, who is a good bet for Frank's father.Mother Dora, age 60, born Russia.
1920 Strasberg, Emmons Co., ND: Martha Schlosser, age 28, Marital status: WS (I have not seen this before, but would guess Widow/Single), b. Russia Helena, age 5, b. U.S. Maria, age 4, b. U.S. Fransika (Francisca??), age 1, b. U.S. Anna, age 1, b. U.S. (twins) Michael Fischer, age 25 Anton Fischer, age 16 Michael and Anton are listed as "sons", but that's impossible given their age - most likely Martha's brothers, so her maiden name would have been Fischer.
Anton Schlosser, age 73, is still nearby, but with an apparent second wife, much younger.