Theodore Cresswell was born about 1906 in redwood Falls Minnisota to Peter McKay and Elizabeth Smith. She died shortly after. He remarried pretty soon after that. The baby died in 1910 in Argyle, Illinois, where his mother had a lot of family. There were other young children and he remarried quickly so odd they would send the baby off. So Creswell (what they called him shows up in 1910 Illinois Census in home of brother and sister of his mother
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKF6-Q7Z : accessed 11 July 2018), Creswell Mchay in household of Hugh Smith, Harlem, Winnebago, Illinois, United States; citing enumeration district (ED) ED 144, sheet 10A, family 92, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 336; FHL microfilm 1,374,349.
He also shows up in 1910 in the household of his father and stepmother
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2G1-SJH : accessed 11 July 2018), Creswell Mckay in household of Peter Mckay, Kintire, Redwood, Minnesota, United States; citing enumeration district (ED) ED 114, sheet 2A, family 21, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 713; FHL microfilm 1,374,726.
My guess is that he was in Illinois (where he died later that year) and his father just reported him as a son in Minnisota?