William Selby died 1901 (spouse Elizabeth J.) http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=29435562
It appears that the William who died in 1901was married to Jane/Elizabeth Kilpatrick seen below. Don't know who the William married to Viola is, in the 1880 census that you show.
Source: "United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MX6V-6FJ : accessed 10 June 2016), George Selby in household of William Selby, Indiana, United States; citing p. 31, family 230, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,867.
William Selby M 32 Indiana
Jane Selby F 32 Indiana
George Selby M 9 Indiana
Minney Selby F 4 Indiana
Edgar Selby M 1 Indiana
John Selby M 0 Indiana
Source:"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MH9M-L4Z : accessed 10 June 2016), William Selby, Barton, Gibson, Indiana, United States; citing enumeration district ED 107, sheet 228C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0279; FHL microfilm 1,254,279.
William Selby Self M 42 Illinois
Elizabeth Selby Wife F 42 Indiana
George Selby Son M 18 Indiana
Minnie Selby Dau F 13 Indiana
Edgar T Selby Son M 11 Indiana
John W Selby Son M 9 Indiana
Source: "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MM13-2CT : accessed 10 June 2016), William Selby, Barton Township (part of), Gibson, Indiana, United States; citing sheet 4A, family 73, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,372.
William Selby Head M 63 Illinois
Elizabeth J Selby Wife F 62 Indiana
Susannah Walton Boarder F 80 SC
Source: "Louisiana Deaths Index, 1850-1875, 1894-1956," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F3QH-878 : accessed 10 June 2016), George Selby, 18 Mar 1926; citing Livingston, Livingston, Louisiana, certificate number 4887, State Archives, Baton Rouge; FHL microfilm 2,381,335.
Name George Selby
Death 18 Mar 1926 Livingston, Livingston, Louisiana
White Male
Age 65 Birth (Est) 1861 Machie, Indiana
Father Wm Selby Mother' Jane Kilpatrick
Source: "Indiana Marriages, 1811-2007," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VH4K-1D9 : accessed 10 June 2016), William Selby and Jane Elizabeth Kilpatrick, 22 Dec 1859; citing Gibson, Indiana, United States, various county clerk offices, Indiana; FHL microfilm 1,434,696.
Name William Selby
Marriage Registration 22 Dec 1859 Gibson, Indiana
Marriage License Date 21 Dec 1859
Marriage Place Gibson, Indiana
Spouse Jane Elizabeth Kilpatrick
Female
Officiator's Name J W Skelton
Page 382