I am adding Jospeh as Hiram father because he was living with them in 1870 census. His wife is Harriet Rockwell.
Sources
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXS5-KFD : accessed 12 May 2016), Joseph W Rockwell, Rome, Ashtabula, Ohio, United States; citing family 1385, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"Illinois State Census, 1865," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XCK4-K6J : accessed 12 May 2016), J W Rockwell, , Dwight, Livingston, Illinois; citing p. 102, State Library, Springfield; FHL microfilm 972,757.
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6HS-TCF : accessed 12 May 2016), Joseph Rockwell in household of Hirum Rockwell, Illinois, United States; citing p. 10, family 73, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,746.
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