In the 1860 census and others, there are Cyrus and Emma Higgins living with Maria. They may be younger siblings, though one census says it was Emma was a niece.
Sources
"Ohio, County Marriages, 1789-2013," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XZBM-Q5Y : 10 February 2018), David H Armantrout and Maria Higgins, 17 Mar 1853; citing Montgomery, Ohio, United States, reference ; county courthouses, Ohio; FHL microfilm 1,030,834.
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MX63-RW9 : 12 April 2016), Maria Armnitrout in household of David Armnitrout, Indiana, United States; citing p. 6, family 42, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,842.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MH9T-PVD : 14 August 2017), Maria Armantrout in household of David Armantrout, Peru, Miami, Indiana, United States; citing enumeration district ED 120, sheet 538C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0298; FHL microfilm 1,254,298.
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