Joseph T. Callahan was born about 1781 and died in 1851, probably in November.
Joseph Callahan was listed in the 1850 census of Yancey Co. NC as 69 years old and born in North Carolina. There has been speculation from several genealogists that Joseph was either the son of Joel Callahan of Greenville, SC (1754-1847) or a son of Henry Callahan of Rutherford Co. NC (1754-1830). To date, however, no connection to either family has been proven. 
Joseph married first Unknown Chandler, the daughter of John Chandler. Joseph is mentioned in his will. John Chandler. She died before 1825, so Joseph was an heir. Elizabeth, in the 1850 Yancey census, was a later wife.
Joseph married second Elizabeth Eliza Unknown (1787–1850). They had the following children:
The Holcombes: nation builders ; their biographies, genealogies, and pedigrees / by Mrs. Lewin D. (Hannah Elizabeth Weir) McPherson. Author McPherson, Hannah Elizabeth (Weir) 1878-Call Number GENE WYO 929.2 HOLCOMB M Publication Date 1947
William Holcomb (1650-aft.1705) and Simon Gross (b.1711) - Their Families and Decendants" by L. Margaret (Holcomb) Wellborn, P.O. Box 259, Lake Lure, NC 28746 - Ward Publishing Company, 1992
"United States Census, 1850," database with images, FamilySearch (Index Link : accessed 27 September 2015), Joseph Callaham, Yancey county, part of, Yancey, North Carolina, United States; citing family 1170, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
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It may be possible to confirm family relationships with Joseph 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 (beta) of DNA with Joseph: