"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHRG-GG3 : 11 August 2016), William A Butterworth in household of William Butterworth, Londonderry, Rockingham, New Hampshire, United States; citing enumeration district ED 215, sheet 232A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0767; FHL microfilm 1,254,767.
"New Hampshire, Marriage Records, 1637-1947," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FLXC-XYG : accessed 25 Mar 2014), William A. Butterworth and Edith Belle Lowd, 17 May 1893; citing Londonderry, Rockingham, New Hampshire, Bureau of Vital Records and Health Statistics, Concord; FHL microfilm 1000971.
"Massachusetts Births, 1841-1915", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FXHN-BT8 : 1 March 2016), Wm. A. Butterworth in entry for Walter Chester Butterworth, 1902.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2VN-G1Z : 29 October 2015), William A Butterworth, Lowell Ward 9, Middlesex, Massachusetts, United States; citing enumeration district (ED) ED 883, sheet 7B, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,614.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MX19-T8K : 14 December 2015), William Butterworth, Lowell Ward 8, Middlesex, Massachusetts, United States; citing sheet 4A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,712.
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I just read the message you wrote that Butterworth is his adopted surname. You should put EITHER Conway, OR Conroy for his Last Name at Birth. Then the other spelling goes in the 'Other Last Name' box.
'Conway_or_Conroy' is not a correct way to name someone on WikiTree. Please change the Last Name At Birth for this profile to his correct birth name. His father's surname was Butterworth. Shouldn't his Last Name at Birth be Butterworth?