Nebraska is a more difficult state to do research in since they don't "publish" their vital records.
According to the Jones Family Tree, Stephen 'Steve' Spencer Corbett b. 1871 in Canada, married Minna 'Minnie' E. Spint 3 June 1903 at Columbus, Platte, Nebraska Courthouse.
Minnie/Minna died and he married Cassandra 'Cassie' S. abt. 1923 in Nebraska. Most larger libraries provide free access to ancestry.com.
You can also order copies of the marriage licenses from the Polk County Clerk, www.polkcounty.ne.gov/clerk.html.
In 1900 Stephen was living in Canada, polk, Nebraska. Mary Corbett, head, b. Canada Sept 1835, had given birth to 10 children and 9 alive in 1900, immigrated 1872, farmer. Stephen Spencer Corbett, son, b. Canada Oct 1871, imm 1872, naturalized, farmer.
Didn't find the 1910 Census.
In 1920 Stephen was living in Canada. Stephen Corbett, b. Canada, 48, widower, imm 1872, general farmer. Mary Spint, malaw, b. WI, 64, widow, farmer general.
In 1930 Stephen was living in Canada. Steven S. Corbett, b. Canada, 58, gneral farmer. Casandar S., b. NE< 46. Margaret Lockard, neice, b. NE, 17. Velda Lockard, neice, b. NE, 16. Successful Searching!