Jacob was born in 1811. He was the son of Henry Long and Nancy Kiker. He passed away in 1891.
Sources
"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M4BW-GFK : 23 December 2020), Jacob G Long, Cabarrus, Cabarrus, North Carolina, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
"North Carolina Deaths, 1906-1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:F3C9-X8K : 20 February 2021), Jacob G. Long in entry for Martha Clementine Gray, 01 Mar 1917; citing Twp. No. 1, Cabarrus, North Carolina, reference fn 248 cn 149, State Department of Archives and History, Raleigh; FHL microfilm 1,892,186.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MC66-ZNY : 19 February 2021), Jacob G Lang, Rocky River, Cabarrus, North Carolina, United States; citing enumeration district ED 39, sheet 514C, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,955. Parents both born in North Carolina
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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 ancestors' Y-chromosome or 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:
Either this profile or Jacob Long appear to have the incorrect parents or spouse. It doesn't look like he married twice based on the marriage and death dates of the spouses.
Find a grave has a lot of people connected to the wrong Henry Long, I think. Linked mother is Fannie, but biography has Nancy (Keicher) Long (abt.1790-bef.1850). I have already removed 2 siblings from Henry Long and Fannie and reconnected them to Nancy and no father based on later census that showed their parents were born in North Carolina not Pennsylvania. I will review the rest of the children since the family wouldn't have 2 children with same name, both living also.