C. Barney was enumerated on the next line in the 1880 census and his relationship was "father". It's unclear if this means he was M. Colbert's father or the father of the head of household O. T. McCarty. It seems more likely he was the father of the head of household because they were both born in Ohio.
Sources
1880 Census: "United States Census, 1880" citing Volume: 1; Affiliate Name: The U.S. National Archives and Records Administration (NARA); Affiliate Publication Number: T9; Affiliate Line Number: 00091; Digital film/folder number: 005161279; FHL microfilm: 1254748; Image number: 174; Sheet number: 295; Sheet letter: B; Packet letter: B FamilySearch Record: M8YZ-TGR (accessed 17 May 2024) FamilySearch Image: 33S7-9YB3-9K9Z M Colbert (39), single other, in household of O. T. McCarty (31) in Omaha, Douglas, Nebraska, United States. Born in Canada.