I believe there may be a problem here -- a missing generation. The children shown here seem to be born too late for this couple. I have family information that shows they had a son named Billy, but no good sources. Any help will be appreciated. Perhaps Billy was the one who married Marion Smith.
"Minnesota State Census, 1905," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SP3Y-LPG : 4 August 2017), Wm Donelly, St Paul, Ward Number: 05, Ramsey, Minnesota; citing p. 204, line 36, State Library and Records Service, St.Paul; FHL microfilm 928,806.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2P6-NY3 : accessed 23 October 2018), William Donnelly in household of John W Schaules, St Paul Ward 11, Ramsey, Minnesota, United States; citing enumeration district (ED) ED 150, sheet 1A, family 3, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 720; FHL microfilm 1,374,733.
Second hand information from family letter dated 8/1966.