Beckwith married three times, first to Hazel Frances Holland (formerly Wilson; 1899–1966), in March 1927, second to Annemarie Hoffman (born ), in November 1967, and third to Margaret Elizabeth Hogan (formerly Fristoe; 1921–2009), in 1979. His marriage to Holland lasted nearly four decades, ending with her death in 1966. His marriage to Hoffman lasted almost nine years, ending in divorce in September 1976, and his marriage to Hogan ended with his own death, in 1985. Beckwith never publicly acknowledged paternity for any child, making him the last confirmed descendant of
Abraham Lincoln, the 16th President of the United States. However, he did have step-children through his marriages to Holland and Hogan. Hoffman alleged that her son, Timothy Lincoln Beckwith born in 1968, during her marriage to Beckwith, was fathered by him, but her failure to present the child for
paternity testing coupled with proof Beckwith had undergone a
vasectomy some years prior to the child's birth led the
Superior Court of the District of Columbia to declare that Beckwith was not the father. Despite the court's ruling, Timothy's claims to Beckwith's estate were never terminated, and after Beckwith's death in 1985, charitable organizations that had been named as beneficiaries in Beckwith's will offered Timothy, then 17 years old, a settlement of US$1,000,000 () in exchange for giving up any claims to the estate. Since 1995, Timothy has worked as an assistant
state's attorney in
West Palm Beach, Florida, and maintained a relatively low profile, though articles speculating about his paternity and possible relationship to Abraham Lincoln continue to be published. ==Death==