Herman Petri was the son of German immigrant Phillipine Petri. He appears as a child in the 1880 Census.
Sources
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ6H-C99 : 17 August 2017), Herman Petri in household of Philipine Petri, New York, New York, New York, United States; citing enumeration district ED 250, sheet 213C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0878; FHL microfilm 1,254,878.
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