Based on the 1850 census, in which the family matches the 1860 census, George was born in England.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MC11-YB9 : 9 November 2014), George Suttle, Shandaken, Ulster, New York, United States; citing family 389, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).