They show up in Jefferson township, Montgomery, OH in the 1930 census (page 12A, book 227, district 155). However, this time it shows he was born in South Dakota and parents born in Massachusetts.
The closest I can find in our database is a Louis Welcome born in 1885 in the Greenfield, MA area. I lose track of him after the 1900 Greenfield, MA census. Doubtful if it is the same person, but one never knows for sure. :^)
Canadian Fontaine Genealogy Association www.canfga.org