According to marriage record, Emily's father's name is Joseph Law.
Sources
Marriage Record to Horace Hartwell
"Massachusetts Marriages, 1841-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:NW51-8S2 : 24 May 2018), Horace G. Hartwell and Emily Law, 21 Aug 1855; citing Dunstable, Middlesex, Massachusetts, United States, State Archives, Boston; FHL microfilm 1,433,014.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MH6R-F9G : 12 August 2017), Emily Hartwell in household of Horace G Hartwell, Pepperell, Middlesex, Massachusetts, United States; citing enumeration district ED 372, sheet 388A, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,539.
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