On Friday, they attended King Charles' reception at Buckingham Palace and were photographed speaking with Kate Middleton.
Finnegan is Hunter Biden's middle child
Finnegan, 23, is the middle daughter of Hunter Biden and ex-wife Kathleen Buhle. Her sisters are Naomi Biden, 29, and Maisy, 22. She also has a 3-year-old half-brother, Beau Jr., who her father shares with his wife, Melissa Cohen, and a 4-year-old half-sister Hunter shares with Lunden Alexis Roberts.
"I don't necessarily pick up everyday, but I have a lot of voicemails," Finnegan said of President Biden, or "Pop," as his grandchildren call him.
President Biden confirmed the frequent phone calls in a 2022 episode of the "Smartless" podcast. "They're crazy about me and I'm crazy about them," he said about his grandchildren.
In a January 2021 interview with Jenna Bush Hager, Finnegan reflected on the moment she and her cousins heard the 2020 election results.
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"Everyone was crying," Finnegan said. "We just embraced each other. I think we'll always remember that moment."
Her sister Naomi shared a photo of the moment on Twitter.
Finnegan traveled with her grandfather while he was vice president
Before being elected as president, Finnegan accompanied her grandfather, then vice president to former President Barak Obama, on several overseas trips.
Little else is known about Finnegan as she remains private with no public social media accounts.
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