David was born about 1832. He is like the son of James Miller and his wife Catherine.  David married Ellen Avery. In 1860 they are enumerated on the federal census, also in Putnam County, New York. 
↑ "United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MC1H-3FC : 4 April 2020), David Miller in household of James Miller, Phillipstown, Putnam, New York, United States; citing family 143, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).