"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8J5-SN9 : 12 April 2016), George Tweed, New York, United States; citing p. 49, family , NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,544. Household of Senator William Tweed. Probably twin of Charles Tweed, same age.
Find A Grave, database and images (https://www.findagrave.com : accessed 07 June 2018), memorial page for George Y. Tweed (unknown–Jul 1905), Find A Grave Memorial no. 57424237, citing Green-Wood Cemetery, Brooklyn, Kings County (Brooklyn), New York, USA ; Maintained by T.V.F.T.H. (contributor 46496806) . Green-Wood Cemetery, Plot 6447, Section 55, with other family members.