"United States Census, 1870," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MXLR-C2P : accessed 04 Oct 2014), Jacob O Groomer in household of Jacob Groomer, Texas, United States; citing p. 29, family 204, NARA microfilm publication M593, FHL microfilm 000553087.
"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MFNX-42W : accessed 04 Oct 2014), Jacob G Grovmer in household of Jacob Grovmer, Precinct 7, Grayson, Texas, United States; citing sheet 386D, NARA microfilm publication T9.
"Texas, Births and Christenings, 1840-1981," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/F65M-SMX : accessed 04 Oct 2014), Jacob Garrett Groomer in entry for Walter Earl Groomer, 27 Oct 1888; citing St Jo, Montague, Texas, reference ; FHL microfilm 1435325.
"United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MLQF-D3R : accessed 04 Oct 2014), Jacob G Groomer, Patterson, Jefferson, Oklahoma, United States; citing enumeration district (ED) 155, sheet 4A, family 38, NARA microfilm publication T624, FHL microfilm 1375267.
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MXLS-S84 : accessed 04 Oct 2014), Jacob F Groomer, Precinct 54, Las Animas, Colorado, United States; citing sheet 3A, family 57, NARA microfilm publication T625, FHL microfilm 1820166.
"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X74D-RFQ : accessed 04 Oct 2014), Jacob G Groomer, Branson, Las Animas, Colorado, United States; citing enumeration district (ED) 0059, sheet 1A, family 7, NARA microfilm publication T626, roll 245.
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DNA Connections
It may be possible to confirm family relationships with Jacob by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Jacob: