I apologize if what information I present from the census is something you already had; but I didn't. I always start from scratch...if needed, so I can expand.

The 1900 Census for Dixie, Walla Walla County, Washington
John C. Warren, born may 1860 in Missouri to father born in Virginia (West?), and mother in Germany, carpenter, married 19 years.
Margeat (?as written), born Nov 1863 in Iowa to both parents born in Ohio. Mother of 6, 5 living
Ethel C?, born December 1882
Arthur M, born Oct 1884
Jennie L, born Jan? 1889
Edna L, born Jan 1891
Allen, August 1891. All children born in Washington

The 1910 census for Walla Walla
John C, now 48, same birth data, now a Street Laborer
Margaret, Jennie L, and Allen A, living at home.

The 1920 Census for Dixie, Walla Walla Co
John C, Margarete (as written) and Allen living in the home.

The 1930 Census for Dixie, Walla Walla Co.
John C. Warren 68, and Marguerite J, 66 living together.

--------------------John Cyrus Warren------------------
John Cyrus Warren was born 30 May 1861 in Lawrence, MO. He died 28 January 1939 in Dixie, WA.
He married Margaret Justina Lanning, born 28 Nov 1863 in Otter Creek, Linn County, Iowa. They married on 11 Dec 1881 in Dixie. Margaret died on 10 Nov 1937 in Dixie. She was the daughter of Leonard N. Lanning and Pheoba Jane Andrews. (This info was compiled by an Audrey Rozanoff. Other information was found from a family tree owned by a Lowell S. Thomas, seadragon5@aol.com Since the info identifies Edna Lillian Warren, this person might be so related. I can't identify if this is a current email address, last update was Sept 2007).

------------Arthur M. Warren---------------
The Washington Birth Index showed Arthur Marvin Warren born 30 Oct 1884 to John Cyrus Warren and Magt Lanning. Born in Asotin County.

The World War I Draft Registration Card image database shows Arthur Marvin Warren born October 30, 1884, living at 1330 1/2 Broadway, Tacoma, WA. He was a ship wright for the Foundatwn? Ship Building Co. His nearest relative was Mrs. A. Warren in Sumner, WA.

The 1910 Census for Sumner, Pierce County, WA
Arthur M. Warren, age 25, born in WA to father born in Missouri, mother in Iowa, farmer, married "0" years.
Jennie, age 18, no children
Mary J. Spurback, mother-in-law, age 51, widow, born in Missouri

The 1920 Census for Seattle, King County
Arthur M. Warren, age 36, Express Driver, marital status "appears to be "D" for Divorce.... But...

The 1930 Census for Seattle, King County, WA, Owned at 3439 15th Ave S.
Arthur M. Warren, age 45, expressman for Railway express.
Jennie E, age 38
P. Ella, daughter, age 19, born in Washington

The Washington Death Index: Arthur M. Warren died 7 December 1946 in Seattle, at age 62 years, 1 month and 27 days. He was married to Jennie E. His father was John Cyrus Warren, mother was Margaret J. Lanning. He was buried on 9 Dec 1946.
-------------Edna Lillian Warren------------
Married Gilbert Arthur Dodge, born 15 Sep 1886

Edna was born 19 January 1891 in Clarkston, WA. She died 4 Oct 1983 in Seattle, WA.

The 1920 Census for Seattle, King Co. Owning at 16th Ave S.
Gilbert Dodge, born in North Dakota, messenger for express company
Edna, 28, born in WA to father born in Missouri, mother in Iowa
Audrey, dau, 4 1/12, born in Oregon.

The 1930 Census for Seattle, King Co, WA
Gilbert Dodge, born in North Dakota, manager of an Express Co. (The same as Arthur was working?)
Edna, age 39, born in WA to father born in Missouri, mother in Iowa
Not readible, age 14, (idenfied as a son, but Audrey above would have been 14, but a daughter), born in Oregon
Helen, age 8

--------------------Allen A. Warren
The 1930 Census for Seattle, King County, WA
Allen A. Warren, age 30, born in WA to father born in Missouri, mother in Iowa, driver for transfer company
Velma I, age 23, born in WA to father born in Kansas, mother in Missouri
Dwayne L., son, age 1 11/12 (appears to be 11/12) (census eumerated April, so he was born circa April/May 1928)
Roff, Vincent C, brother-in-law, age 21
Anna M, sister, age 18. born in WA to father born in Kansas, mother in Missouri
--based on birth of parents, Anna was sister to Velma.

--In the Washington State Archives: http://www.digitalarchives.wa.gov/Index.aspx
is a marriage certificate for a Dwayne L. Warren, marriage to Loretta G. Sargent, both from Litchfield, California. The marriage was in Walla Walla on 10 June 1954. Witnesses Joseph Roff and Shawn J. Roff

--There is a Dwayne L. Warren, born 12 April 1928, died 26 January 1996. His Social Security Number, 534-20-2972 was issued in Washington. His "last residence" was Mesa, Maricopa, Arizona.
- In the Social Security Death Index, it lists persons that have died whose deaths are reported to the Social Security Administration. The "last residence" is not necessarily were a final benefit check had gone. It could be the address where the Death Benefit was sent, today about $255.00, to a spouse or other person that paid for burial, funeral home/Attorney/etc. It also could be just from a notification of their death. It is not necessarily where they died, it "usually is; but it is NOT a exact address identifier.
---However, the Maricopa County Recorder identifies several recorded documents under the name of Dwayne L. Warren. Documents at THIS county are on a BUY system. MANY around the country offer Free viewing of PUBLIC RECORDS. FIGHT to keep these public records FREE and AVAILABLE.

----From the WA Death Certificates: Allen Keith Warren, died 27 July 1926 at age 1 year 9 months and 6 days. He was son to Allen Warren and Velma Johnson.

So, enough for this search. For those Washington Deaths that I identified:
The Washington State Library has a free research service, the ask-a-librarian program, where they will look for information in the archives, in this case the newspaper microfilm for an event, such as an obituary. They will look up to an hour and send you the results. Contact them at: http://www.secstate.wa.gov/library/ask.aspx .

Ron Bestrom