His parents are noted as Peter Jensen (1885 - 1952) and Gena Holm (1884 - 1969). Therefore the family I found in the census in Polk County, Wisconsin was correct (I accidentally said Polk County, Minnesota, but this website won't let me fix the error).
The creator of the memorial is named Wendi - like you. The facts posted are KEY FACTS in answering your present query so even if you already know them, we need to add them to this thread to help researchers to help you.
Peter Jensen Birth: 26 August 1885, Denmark Death: 27 August 1952, Polk County, Wisconsin, USA and Jorgina "Gena" Holm Birth: 31 January 1884, Denmark Death: 12 June 1969, Polk County, Wisconsin, USA both buried Pleasant Valley Cemetery Laketown Township, Polk, Wisconsin
In 1910 census a child named Torvald is listed, born between Nels Christian Jensen and Henry H Jensen. The birth record for Torvald T. Jensen in Freeborn County, Minnesota, gives his mother's maiden name as Nelson.
The Minnesota Historical Society (MnHS) birth record for Henry Jensen in Freeborn County, Minnesota gives his date of birth as 06 April 1904; this matches the birth date for him on findagrave. The MnHS transcription of the original birth record gives his mother's maiden name as Nelson.
So that's three children born to this mother who give her maiden name as Nelson. If you explore further, you may find more mentions of Nelson (more birth records and death records for these children).