Luke was born about 1835. He is the son of Micheal Keough.
Sources
Sister's obituary
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9SR-2C7 : accessed 15 November 2020), Luke Keough, Cleveland Township Cleveland village, Le Sueur, Minnesota, United States; citing enumeration district (ED) 62, sheet 5A, family 90, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,773.