Hi Doris,
In 1900 Cora and Columbus Purcell were living in Fayette, Canyon Co., ID.
Marion, head household, b. IN, May 1839, widower.
Columbus, son, b. IA June 1867, married.
John, son, b. IA Dec 1880, single.
Oliver, son, b. IA, Jan 1873, single.
Cora, daulaw, b. IA, March 1877, married.
Walter, grandson, b. IA March 1888.

Nep, Isabelle and family Purcell are listed on the same Census page.

In 1910 Cora and boys are living in Logan, Harrison, Iowa.
Susan Butcher, head household, b. IA, 37 yrs old, single, laborer.
Elizabeth Butcher, boarder, b. OH, 65, had given birth to seven children but only five alive in 1910.
Davie Butcher, boarder, b. IA, 26, single.
Cora Purcell, sister, marr 8 yrs, b. IA, 32, housekeeper.
Clarence Purcell, son, b. SD, 6.
Reva Purcell, son, b. IA, 4.
Sadie Whiteman, sister, b. IA, 23, marr 6 yrs, had one child who is still alive, laundress.
Delmer Whiteman, son, b. IA, 5.
Moris or Wyton? Walton, neice, b. IA, 6.

I didn't find any 1910 Census info for Columbus.

Didn't find any 1920 Census for Cora or Columbus.

In 1930 Cora and Columbus were living in Payette, Payette Co., ID.
Columbus, b. IA, 63, marr @ 32, farm laborer.
Cora, b. IA, 52, marr @ 22.
Clarence, b. SD, 26, single, farm laborer.
Riva [Census spelling] D., b. IA, 24, divorced, house carpenter.

A Columbus Martin Purcell died April 6, 1942 in Payette, Payette Co., ID, b. June 29, 1867 per death cert #128915. Source: ID Death Index 1911-51, www.ancestry.com.

I suggest you look for his obituary. You could post on the Idaho, Fayette Co Message Board.

On 21 Sept 1942 Clarence R Purcell b. 1904, South Dakota, State of Residence=Oregon, County or City=Harney enlisted in the U.S. Army in Portland, Oregon. Education=grammar school, Civil Occupation=farm hands, animal & livestock, Martial Status=single without dependents. Source: U.S. World War II Army Enlistment Records 1938-46, www.ancestry.com.

A Cora E. Purcell died Portland, Multnomah Co., OR 14 Dec 1949 per death cert #13431. Source: OR death Index 1903-98, www.ancestry.com.

There are two Random Acts Genealogical Kindness in Multnomah Co who will look up obituaries (Jenny and Kristeen). Go to RAOGK's web site, www.raogk.org, choose Oregon, choose Multnomah Co.

There is one independent volunteer, Eelitta at russsetred@msn.com .

I found a Family Tree on your family on Ancestry. I notified the owner=purrfish=Charlotte to contact you. She said she'd try to find you on Rootsweb. You might want to consider changing your user profile and listing your email ID. I've listed mine for years and had no problem. Successful Searching!