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The Lincoln descended family comprises all the descendants of Abraham Lincoln and Mary Todd Lincoln. There are ten known descendants of Lincoln. 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.[nb 1] 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.
^Robert's second wife did have a son, named Timothy Lincoln Beckwith, and listed Robert as the father, which would make Timothy 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.
^Thomas Lincoln, Jr., the younger brother of Abraham Lincoln, was born in 1812 at Knob Creek Farm in Kentucky and died 3 days later. He contracted an unknown sickness at two days old, and the elder Thomas hired a doctor, Daniel B. Potter of Elizabethtown to treat the child. However, despite his best efforts, the baby could not be saved, and Thomas Lincoln, Sr. paid Potter US$1.46 for performing the attempted treatment.