 He also said that his mother had told him that Jefferson had been absent for 15 months prior to the birth of one of Sally Hemings' children, so could not have been the father.In 1998, the Carrs were disproved as possible fathers of Eston Hemings, Sally's youngest son, by the results of a Y-DNA study of their male descendants; no genetic link existed between the Carr and Hemings lines for the descendants of Eston Hemings.The test results did show a match between the Jefferson male line and the descendant of Hemings, though it showed nothing about the descendants of Sally Hemings's other children.