There is a Charles Hurd in the 1870 US census. He is 32 years older than George and might be the father (purely speculation at this point).
Sources
"United States Census, 1850," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MWZK-1TR : accessed 25 Mar 2014), George Hurd, Londonderry, Rockingham, New Hampshire, United States; citing family 897, NARA microfilm publication M432.
"United States Census, 1860," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M7WK-L9C : accessed 25 Mar 2014), George Hurd, Londonderry, Rockingham, New Hampshire, United States; citing "1860 U.S. Federal Census - Population," Fold3.com; p. 33, household ID 262, NARA microfilm publication M653; FHL microfilm 803679.
"United States Census, 1870," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MH52-HPC : accessed 25 Mar 2014), George Hurd, New Hampshire, United States; citing p. 32, family 299, NARA microfilm publication M593, FHL microfilm 000552346.
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