From records that exist.
Randolph never visited his brother before 1802?
Monticello was built by 1772.
So for 30 years, Randolph never came to Monticello to visit his older brother and the uncle of his own 6 kids?
(Notice Randolph had 6 kids—must have been potent)
Bad blood between them?
Regardless, from the source you cited:
“Since then, a committee commissioned by the Thomas Jefferson Heritage Society, after reviewing essentially the same material, reached different conclusions, namely that Sally Hemings was only a minor figure in Thomas Jefferson’s life and that it is very unlikely he fathered any of her children. This committee also suggested in its report, issued in April 2001 and revised in 2011, that Jefferson’s younger brother Randolph (1755-1815) was more likely the father of at least some of Sally Hemings’s children.”
Why would the younger brother of Jefferson, who was not known to have visited Sally’s conception times be thought to be the father of her children?
She slept within inches of Thomas Jefferson. It seems strange that his brother would be sneaking in from another county to have sex with his brother’s handmaid.
In those times it could take as long as a year or more to go from North Carolina to New Jersey - have that from a family record.
“Since then, a committee commissioned by the Thomas Jefferson Heritage Society, after reviewing essentially the same material, reached different conclusions, namely that Sally Hemings was only a minor figure in Thomas Jefferson’s life and that it is very unlikely he fathered any of her children. This committee also suggested in its report, issued in April 2001 and revised in 2011, that Jefferson’s younger brother Randolph (1755-1815) was more likely the father of at least some of Sally Hemings’s children.”
From Wikipedia:
In the fall of 2001, the National Genealogical Society Quarterly reported that the "weight of historical evidence" and the DNA study were sufficient to conclude that Jefferson had a long relationship with Hemings and fathered all her children. They strongly criticized a report issued that year by the newly formed Thomas Jefferson Heritage Society (TJHS); they said it failed to follow best practices in historical and genealogical analysis. Helen F.M. Leary, a certified genealogist, concluded: "the chain of evidence securely fastens Sally Hemings's children to their father, Thomas Jefferson."[21] In a 2002 lecture at the Library of Congress, Leary said: "[M]uch of the evidence marshaled against the Hemings-Jefferson relationship has proved to be flawed by reason of bias, inaccuracy or inconsistent reporting. Too many coincidences must be accounted for and too many unique circumstances "explained away" if a competing theory is to be accepted. The sum of the evidence points to Jefferson as the father of Hemings' children."[22]