The family line is believed to have been extinct since its last undisputed descendant, Robert Todd Lincoln Beckwith, died on December 24, 1985 without any children.
Robert's second wife did have a son, named Timothy Lincoln Beckwith, and listed Robert as the father, which led some to believe that Timothy is Abraham Lincoln's great-great-grandson and only living descendant. Robert denied paternity of the child, claimed he'd had a vasectomy years earlier, and a divorce court ruled that he was not the father. It is rumored that there may be additional living descendants, but scholars disagree as to the legitimacy of these claims. However, the Lincoln family does have surviving relatives who share common ancestors with the former president.