. . . "DNA study" . . "claiming that Sally Hemings was Thomas Jefferson's concubine" . . . . . . "Hemings family" . . . "a decades-long relationship" . . . "historical controversy" . "Jefferson\u2013Hemings controversy" . . "likely" . . . "relationship" . . . . "Jefferson\u2013Hemings controversy" . "relationship was long denied" . . . . . . . "the relationship between" .