In 1930 the Nelson family was living in Somerset, Mercer, Missouri. Shadrick Nelson, b. Ky, 44, general farmer. Lena, wife, b. IA, 38. Alice M., b. IA, 17. Fernald, b. IA, 15. Vernon, b. IA, 13. Marilyn, b. IA, 7. Donald, b. IA, 5. Daryol, b. IA 2 6/12ths.
I found the Where We Come From Family Tree, trees.ancestry.com/tree/5102980/person/-1352304068 which contains your Nelson family.
In 1900 Shadrick married an Aleeda V. Wallow. She had Vera Marie Norton and Wyla Norton so I think she was married before.
In 1911 Shadrick married Lena Elizabeth Zeller in Iowa.
I'd look for Alice's marriage info in Mercer County, Missouri. Do a Google search for Mercer County Missouri Clerk Recorder or Mercer County Missouri Genealogy.
A Fernald L. Nelson Born: 3 Oct 1914 Last Residence: Greentop, Adair, MO Died: 7 Feb 1991 His soc. sec. # was assigned in Iowa before 1951. Source: Social Security Death Index.
A Vernon S. Nelson Born: 12 Aug 1916 Last Residence: Davenport, Scott, Iowa Died: 16 Oct 1994 in Davenport, Iowa. Source: Social Security Death Index.
He was married to an Edith Leland b. 1920 in Minnesota. Edith died in Iowa. They had children. Source: Broderick Tree, trees.ancestry.com/tree/891758/person/-2032030679.
He was also married to an Agnes Broderick and they had children. Source: Where We Come From Family Tree.
Marilyn V. Nelson married Mr. Harwood. Source: Where We Come From family tree.
A Marilyn V. Harwood Born: 10 Jan 1923 Last Residence: Cookeville, Putnam Co., TN Died: Nov 1995 Her soc. sec. # was assigned in Iowa before 1951. Source: Social Security Death Index.
I'd check Random Acts Genealogical Kindness for an obituary volunteer for this county or do a Google search for the Cookeville Tennessee Genealogy.
A Wavely Ann Nelson b. 28 Oct 1930 Davenport, Scott, Iowa married an Ernest P. Gerstmar. Source: Where We Come From Family Tree.
A Wavely Ann Gerstmar Born: 28 Oct 1930 Last Residence: Sunnyside, Yakima, WA Died: 13 July 2007 Her soc. sec. # was assigned in Iowa before 1951. Source: Social Security Death Index.
A Wavely Gerstmar Born: Abt. 1931 Died: Abt. 2007, Bend, OR Obituary Date: 13 July 2007 Source: Rootsweb Obituary Index
There is an obituary volunteer at Random Acts Genealogical Kindness. Go to raogk.org Click on Oregon Scroll down to Deschutes Co and choose ONE obituary volunteer.
If that doesn't work out, contact the Bend Genealogical Society, orgenweb.org/deschutes/bend-gs/ .
An Ernest P. Gerstmar Born: 16 Aug 1922 Last Residence: Lebanon, Linn, Oregon Died: 27 Nov 1999 His soc. sec. # was assigned in Ohio before 1951. Source: Social Security Death Index.
There is an obituary volunteer at RAOGK in Linn Co.
If that doesn't work out, contact the Linn County HIstorical Museum, co.linn.or.us/parks/museums/historymuseum.html .
An Ernest P. Gerstmar II Service Info: US Army World War II Buried: IOOF Cemetery, Cemetery Rood, Lebanon, OR 97355. Source: U.S. Veterans Gravesites ca. 1775-2006. Successful Searching!