It appears that his parents may have never married and that Henrietta had him at a very young age. It also appears from Census data that he was raised by his maternal grandparents and his mother remarried and went on to have a family with her new husband. It is suspected that his LNAB was Leonard, then changed very early on to Mills.
Husband of Louise L Dudley
Sources
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXX3-R4H : 12 April 2016), Henry Leonard in household of Hamilton Mills, Indiana, United States; citing p. 12, family 93, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,800.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHMX-BDL : 7 September 2017), Henry N Mills in household of Hamilton Mills, Camden, Carroll, Indiana, United States; citing enumeration district ED 12, sheet 65C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0267; FHL microfilm 1,254,267.
"Indiana Marriages, 1811-2007," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:27V3-BRM : 10 December 2017), Henry N Mills and Louise L Dudley, 23 Jan 1895; citing Vermillion, Indiana, United States, various county clerk offices, Indiana; FHL microfilm 2,224,336.
"Indiana Marriages, 1811-2007," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:27JY-ZM2 : 10 December 2017), Henry N Mills and Louise L Dudley, 23 Jan 1895; citing Vermillion, Indiana, United States, various county clerk offices, Indiana; FHL microfilm 2,224,342.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M996-9K6 : accessed 29 January 2019), Henry Mills, Clinton Township Clinton city Ward 1-4, Vermillion, Indiana, United States; citing enumeration district (ED) 89, sheet 18B, family 395, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,408.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MVL2-SLP : accessed 29 January 2019), Henry No Mills, Riverside Ward 1, Riverside, California, United States; citing enumeration district (ED) ED 73, sheet 10A, family 167, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 91; FHL microfilm 1,374,104.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MH71-XXY : accessed 29 January 2019), Henry Mills in household of Martha Dudley, Riverside Ward 1, Riverside, California, United States; citing ED 115, sheet 10A, line 8, family 84, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 125; FHL microfilm 1,820,125.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XCD3-536 : accessed 29 January 2019), Henry N Mills, Santa Monica, Los Angeles, California, United States; citing enumeration district (ED) ED 1479, sheet 9B, line 54, family 247, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 174; FHL microfilm 2,339,909.
"California Death Index, 1905-1939," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKS9-C6P7 : 8 November 2017), Henry N Miles, 1938; citing 72268, Department of Health Services, Vital Statistics Department, Sacramento; FHL microfilm 1,686,049.
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