Two of US President Joe Biden's 19th-century ancestors on his father's side owned three slaves, according to genealogist Alexander Bannerman. Biden's great-great-great-grandfather, Jesse Robinett, was listed as owning two slaves in Allegany County in the 1800 census, Bannerman found. Biden's 3rd-great-grandfather, Thomas Randle, owned a 14-year-old male slave in Baltimore County, he said.