At familysearch.org I found a World War II draft registration card for Carl Erik SMITH born 28 January 1880 in Gefleborg, Sweden. He lived in Swissvale, Pennsylvania in 1942 and at the same address at the time of the 1920 census. At the time of the 1910 census this person was living at 214 May Way, Braddock, Pennsylvania and is listed under Charles SMITH but with wife, Edla, and two sons Carl and Erik who match up well with the 1920 Swissvale, Pennsylvania census information for Carl E SMITH.
I'm not subscribed to ancestry.com so couldn't check the tree you mention so don't know if you gave a city of birth in Sweden or not.
Hope this is the person you're seeking.