In 1915, the mid-decade, Iowa census did not list family members on a single sheet, but rather an index card so you have to do some hunting to locate members of the household and other relatives.
Here is the 1915 census for Ole and Mari Finnestad's great granddaughter, Lillie (Johnson) Wright.
The census record for Lillie's husband, Frank Wright.
The census record for Ole and Mari Finnestad's great great granddaughter, Evelyn Wright, daughter of Lillie and Frank.
And the 1915 census for Ole and Mari's great grandson, Truman Johnson. (Lillie's brother)
They were all still living in Cylinder, Iowa when this census was taken.
Lillie and Truman were the children of Andrea (Lizzie) Elizabeth (Knutson) and Lambert Johnson, the grandchildren of Elizabeth (Finnestad) and Ole Andreas Knutson.