Horace was a son of David Wyckoff Hendrickson and Sarah Elizabeth Worley. Horace does not appear on the 1870 Census.
Sources
"New York, New York City Births, 1846-1909," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:27B3-D69 : 20 March 2015), Sarah Elizabeth Worley Hendrickson in entry for Horace Nathan Hendrickson, 25 May 1866; citing Manhattan, New York, New York, United States, reference cn 677 New York Municipal Archives, New York; FHL microfilm 1,322,001.
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