Found him on the 1920 Bixby, Perkins, Minnesota census (dist 174 img 1) age 8.
Found him on the 1930 Carroll, Carroll, Iowa census (dist 6 img 2) age 18, baker, bakery. He is single and a lodger in the household of Frank Rettenmeier
Marvin and his wife lived in Rapid City for 17 years before moving to Watertown where he managed Tri-State Milling, now know as Hubbard Milling. They lived here 10 years, returned to Rapid City for 10 years and then moved to Sargeant Bluff, Iowa, for 14 years. Marvin died in 1984 and his wife moved back to Watertown the same year. - Obituary, his wife, Marcella Rollins Finger