Looks like a case of finding the children of George's children.
United States Census, 1880
||Baltimore, Baltimore, Maryland, United States|
|Relationship to Head of Household
|Relationship to Head of Household (Original)
|Birth Year (Estimated)
CITING THIS RECORD
"United States Census, 1880," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:MNQ9-LL7 : accessed 31 May 2016), George Kuhn, Baltimore, Baltimore, Maryland, United States; citing enumeration district ED 7, sheet 123A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0497; FHL microfilm 1,254,497.