Researchers Linked Jefferson DNA to Sally Hemings Descendants

Genetic analysis of hair samples strengthens evidence that Thomas Jefferson fathered children with Sally Hemings.

Updated on Sept. 30, 2026 in Life Sciences

Isometric editorial illustration showing a single magnified strand of hair on a laboratory slide, representing genetic analysis. — Geneticists have confirmed a link between Thomas Jefferson and the descendants of Sally Hemings using DNA extracted from hair samples. AI Illustration. Upload story photo >

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Researchers have used DNA extracted from hair samples to link Thomas Jefferson to the descendants of Sally Hemings. The findings provide new genetic evidence supporting the long-standing claim that Jefferson fathered at least six of Hemings' children.

Why it matters

This research aims to resolve historical uncertainty regarding the paternity of the children born to Sally Hemings. The study brings advanced genomic technology to bear on one of the most significant family histories in the United States.

Researchers achieved a 99.96 percent paternity likelihood by identifying genomic regions identical by descent. The study analyzed hair samples clipped on July 4, 1826, that lacked traditional follicles.

The players

Thomas Jefferson

He was the third President of the United States and the primary author of the Declaration of Independence.

Sally Hemings

She was an enslaved woman at the Monticello estate who is documented to have had children with Thomas Jefferson.

Monticello Association

This organization represents descendants of Thomas Jefferson and manages reconciliation efforts regarding the family history.

Nicholas P. Trist

He was the individual who clipped the locks of Thomas Jefferson's hair on July 4, 1826.

The details

Geneticists analyzed DNA from hair samples collected on the day of Jefferson's death to compare against saliva samples from 16 descendants. The team identified genomic regions shared between the former president and the Hemings descendants to confirm the historical paternity claims.

Martha Wayles Skelton Jefferson died in 1782.
Thomas Jefferson passed away on July 4, 1826.
Geneticists conducted Y-chromosomal DNA tests in 1998.
Research findings were published in a bioRxiv preprint paper in September 2026.

The Big Picture

This study follows the precedent set by the 1998 Y-chromosomal DNA study of Jefferson descendants. By using advanced sequencing techniques on hair samples, this research provides a definitive update to the paternity figures previously established.

The use of hair follicles lacking traditional biological material showcases how ancient DNA techniques can be applied to historical samples. This methodology could eventually allow scientists to extract high-quality data from other historical artifacts previously thought to be unusable.

The takeaway

The study demonstrates that genetic evidence can play a critical role in confirming historical narratives. Readers interested in genealogy may find that historical family legends are increasingly subject to verification through scientific testing.