President Joe Biden arrives at St. Joseph on the Brandywine Catholic Church in Wilmington, Del., Saturday, Dec. 18, 2021. Today is the anniversary of Neilia and Naomi Biden's death. (AP Photo/Matt Rourke)President Joe Biden arrives at St. Joseph on the Brandywine Catholic Church in Wilmington, Del., Saturday, Dec. 18, 2021. Today is the anniversary of Neilia and Naomi Biden's death. (AP Photo/Matt Rourke)President Joe Biden and first lady Jill Biden wait for family as they walk from St. Joseph on the Brandywine Catholic Church in Wilmington, Del., Saturday, Dec. 18, 2021. (AP Photo/Matt Rourke)President Joe Biden and first lady Jill Biden walk from St. Joseph on the Brandywine Catholic Church in Wilmington, Del., Saturday, Dec. 18, 2021. (AP Photo/Matt Rourke)President Joe Biden arrives at St. Joseph on the Brandywine Catholic Church in Wilmington, Del., Saturday, Dec. 18, 2021. Today is the anniversary of Neilia and Naomi Biden's death. (AP Photo/Matt Rourke)President Joe Biden walks from St. Joseph on the Brandywine Catholic Church in Wilmington, Del., Saturday, Dec. 18, 2021. (AP Photo/Matt Rourke)President Joe Biden, third from left, watches as his son Hunter Biden follows his grandson Beau Biden as the family leave St. Joseph on the Brandywine Catholic Church in Wilmington, Del., Saturday, Dec. 18, 2021. Today is the anniversary of Neilia and Naomi Biden's death. (AP Photo/Carolyn Kaster)President Joe Biden and first lady Jill Biden walk from St. Joseph on the Brandywine Catholic Church in Wilmington, Del., Saturday, Dec. 18, 2021. (AP Photo/Matt Rourke)President Joe Biden talks with Monsignor John Hopkins as he leaves St. Joseph on the Brandywine Catholic Church in Wilmington, Del., Saturday, Dec. 18, 2021. (AP Photo/Carolyn Kaster)President Joe Biden, third from left, watches as his son Hunter Biden follows his grandson Beau Biden as the family leave St. Joseph on the Brandywine Catholic Church in Wilmington, Del., Saturday, Dec. 18, 2021. Today is the anniversary of Neilia and Naomi Biden's death. (AP Photo/Carolyn Kaster)
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President Joe Biden arrives at St. Joseph on the Brandywine Catholic Church in Wilmington, Del., Saturday, Dec. 18, 2021. Today is the anniversary of Neilia and Naomi Biden's death. (AP Photo/Matt Rourke)
Their deaths occurred just after Delaware voters elected Biden to the Senate in 1972 and the fatal car crash became a defining moment that has shaped his persona and career.
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His sons Beau and Hunter, just under 4 and 3 at the time, were seriously injured but survived the crash. His wife Neilia and 13-month-old daughter Naomi died after their car was broadsided while they were en route to pick up a Christmas tree.
The tragedy haunted him at the start of his Senate career and has been a touchstone of his presidency, with Biden recently opening a speech in Minnesota by noting how two of that state's former senators helped him cope.
Biden married Jill Jacobs in 1977 and they added daughter Ashley to the family. Both joined him at the church Saturday, as did Hunter and his family among others. Beau died of brain cancer in 2015.
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