Why RFK Jr. Did Not Join Annual Kennedy Family July 4 Reunion: Exclusive

A source tells PEOPLE that despite RFK Jr.'s absence, the Kennedys remain "a cohesive family"

<p>Instagram/kerrykennedyrfk</p> Kennedy family July 4 photo 2023

Instagram/kerrykennedyrfk

Kennedy family July 4 photo 2023

In what has become an annual tradition, nearly the entire Kennedy family gathered on Tuesday for their annual Fourth of July family gathering, with one notable exception: Robert F. Kennedy Jr.

A source tells PEOPLE that the absence of RFK Jr. — the 69-year-old nephew of late President  John F. Kennedy and son of late U.S. Attorney General Robert F. Kennedy— is due to the fact that he's currently campaigning for president.

"Bobby has been campaigning," the source tells PEOPLE. "They are a cohesive family. They may differ in their political views but they are family."

RFK Jr. has butted heads with his family members in the past, particularly when it comes to his rhetoric surrounding COVID-19 and vaccines. Just last year, three members of the family wrote an op-ed in Politico denouncing him for pushing anti-vaccination theories online.

In April, more fractures appeared when RFK Jr. announced his plan to challenge Joe Biden for the presidency in 2024.

Related: RFK Jr. Acknowledges His Family &#39;Just Plain Disagrees&#39; with Him Amid Presidential Bid: &#39;I Love Them Back&#39;

The Kennedys have, throughout the past several decades, connected with Biden on multiple fronts, including over their shared Catholic faith, familiarity with loss and, of course, political influence. In July 2022, Biden appointed JFK's daughter, Caroline Kennedy, to serve as the U.S. Ambassador to Australia.

In a statement released that same month, his sister Kerry Kennedy wrote, "I love my brother Bobby, but I do not share or endorse his opinions on many issues, including the COVID pandemic, vaccinations, and the role of social media platforms in policing false information."

Kennedy's youngest brother, Doug Kennedy, a correspondent for FOX News Channel, told PEOPLE at the time that his brother "has immense political talent," but that while he's loved in the family, "not everyone agrees with his positions."

In his first official press conference as a presidential candidate, held in April, RFK Jr. acknowledged that some of his family members "just plain disagree" with his views.

"My whole family including myself have long personal relationships with President Biden ... and many of them just plain disagree with me on issues like censorship and war and public health," Kennedy added. "They are entitled to their beliefs...and I love them back."

Related: Robert F. Kennedy Jr. Files to Challenge President Joe Biden in 2024 Democratic Primary

RFK Jr. was not among those seen in a video shared on Instagram Tuesday by Kerry, which shows dozens of members of the family at the Kennedy compound in Hyannis Port.

In the video, a large group can be seen standing near the water in Hyannis Port as Kerry, holding the camera, can be heard urging those gathered to wish brother Chris a Happy Birthday.

"Happy Birthday Chris!" Kerry captioned the video, adding: "and our beautiful, striving, evolving, majestic, diverse country."

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Over the years, the Kennedy family pic has been something of a Where's Waldo for fans of the political dynasty — including fans of movie star Chris Pratt, who was pictured in the image back in 2019 with his wife Katherine Schwarzenegger. Pratt was spotted toward the back of the shot next to his wife with a big smile on his face.

The Guardians of the Galaxy actor married into the Kennedys when he wed Katherine, whose great uncle was JFK and whose parents are Arnold Schwarzenegger and Maria Shriver.

Previous images have included several notable faces from the family — like 2022's family pic which included Conor Kennedy, Robert F. Kennedy's grandson, and his model girlfriend Ava Dash.

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