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DNA evidence from Thomas Jefferson’s hair reveals the truth about his relationship with Sally Hemings

Researchers said DNA from Jefferson’s hair and 16 living descendants shows a 99.96% chance he fathered at least one of Sally Hemings’s children.

  • On Tuesday, Smithsonian scholar Richard Kurin released a study confirming a 99.9% probability that President Thomas Jefferson fathered children with Sally Hemings, an enslaved woman he held at his Monticello estate.
  • Decades of debate prompted the genomic investigation, as previous studies relied on Y-chromosome markers which could not definitively rule out other male relatives, such as Jefferson's brother, Randolph Jefferson.
  • Researchers utilized an innovative technique to extract DNA from rootless hair samples found in the Jefferson Bible, allowing scientists to analyze autosomal DNA rather than the limited male-line lineage used previously.
  • Genetic evidence definitively links the descendants of Madison Hemings and Eston Hemings to Jefferson, with odds of less than one in 1,000 that he was not the biological father.
  • Kurin described the findings as a "capstone" to years of research, potentially allowing descendants of both Martha Wayles Jefferson and Hemings to view themselves as part of one complex American family.
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The genetic material does not lie: the third US president, Thomas Jefferson, had children with a slave with a very high probability. The analysis reveals a lot about the past – and also about the present.

·Munich, Germany
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Thomas Jefferson hair in Smithsonian Bible helps fuel strongest DNA evidence on Sally Hemings

A hair found in Jefferson’s Bible helped unlock a decade-long DNA investigation into his relationship with Sally Hemings.

·Plattsburgh, United States
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A NEW DNA study, analyzing hair from Thomas Jefferson and his descendants, has confirmed with 99.96% certainty that the former US president had children with enslaved woman Sally Hemings.

·Zagreb, Croatia
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In 2011, when opening a Bible that had belonged to Thomas Jefferson, the staff of the Smithsonian National Museum of American History discovered a reddish blond hair pressed between the pages. It is suspected that that hair belonged to Jefferson himself...

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Smithsonian Mag broke the news in Washington, United States on Tuesday, September 22, 2026.
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