Mary was born about 1848. She is the daughter of T Halleck and Ellen Schryver. Probably the daughter of Ellen, rather than the first wife. She appears age 2 in the 1850 census after the marriage of Ellen.
Sources
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MC1R-HLF : 12 April 2016), Mary A Hallock in household of Thomas G Hallock, Brookhaven, Suffolk, New York, United States; citing family 336, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"New York State Census, 1865," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVNV-JFG6 : accessed 28 July 2018), Mary A Hallock in household of Thomas Hallock, District 01, Brookhaven, Suffolk, New York, United States; citing source p. 57, line 43, household ID 453, county clerk, board of supervisors and surrogate court offices from various counties. Utica and East Hampton Public Libraries, New York; FHL microfilm 2,057,296.
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