Home ahoho The sound of every stroke through the water now carries a much deeper meaning for Jack Schlossberg. What began as a personal challenge has become something far more emotional — a powerful tribute to the sister he lost and a promise to keep her memory alive. The grandson of President John F. Kennedy is taking on a demanding swimming challenge to raise money for a local cancer center in honor of his late sister, Tatiana Schlossberg, who passed away after a battle with cancer. But behind the fundraising effort is a story of love, grief, and a family determined to turn unimaginable pain into hope for others. For Jack, this is not just about completing laps or reaching a goal. It is about celebrating Tatiana’s life, supporting the cause that mattered deeply, and carrying forward the legacy of someone whose absence is still felt every day. Those close to the family say the tribute reflects the bond between the siblings and the impact Tatiana had on everyone around her. As Jack pushes himself through this emotional journey, one question remains at the heart of the mission — the deeply personal reason he chose this challenge and the touching message he hopes the world remembers about his sister.

The sound of every stroke through the water now carries a much deeper meaning for Jack Schlossberg. What began as a personal challenge has become something far more emotional — a powerful tribute to the sister he lost and a promise to keep her memory alive. The grandson of President John F. Kennedy is taking on a demanding swimming challenge to raise money for a local cancer center in honor of his late sister, Tatiana Schlossberg, who passed away after a battle with cancer. But behind the fundraising effort is a story of love, grief, and a family determined to turn unimaginable pain into hope for others. For Jack, this is not just about completing laps or reaching a goal. It is about celebrating Tatiana’s life, supporting the cause that mattered deeply, and carrying forward the legacy of someone whose absence is still felt every day. Those close to the family say the tribute reflects the bond between the siblings and the impact Tatiana had on everyone around her. As Jack pushes himself through this emotional journey, one question remains at the heart of the mission — the deeply personal reason he chose this challenge and the touching message he hopes the world remembers about his sister.

ahoho · 15/07/2026 · comments off

Jack Schlossberg Is Swimming to Raise Money for Local Cancer Center in Honor of Late Sister Tatiana

Tatiana Schlossberg died from acute myeloid leukemia on Dec. 30, 2025

Jack Schlossberg; Tatiana Schlossberg

Jack Schlossberg; Tatiana Schlossberg.Credit : 

Tom Williams/CQ-Roll Call, Inc via Getty; JFK Library Foundation/Instagram

Jack Schlossberg has organized a swimming fundraiser in honor of his late sister Tatiana, who died at 35 in 2025.

Jack, 33, shared that he would participate in the fundraiser in an Instagram Stories post on Tuesday, July 14.

“Hi. We are doing a fundraiser on July 18 for the Martha’s Vineyard Cancer Center in memory of my sister,” he wrote on the post, which featured a throwback of himself standing between his mother Caroline Kennedy and his late sister Tatiana.

“Please donate (or swim!!),” he continued.

The following slide featured a photo of Tatiana in the water while flexing her arm muscles for the camera, captioned “Todd powers.” In a third and final throwback photo shared to his Instagram Stories, Tatiana poses with Caroline, 68, and Jack’s sister Rose, 38.

The fundraiser for the Martha’s Vineyard Cancer Center is being conducted through Swim Across America, according to the official donation page Jack shared.

Jack Schlossberg Is Swimming to Raise Money for Local Cancer Center in Honor of Late Sister Tatiana
Jack Schlossberg Is Swimming to Raise Money for Local Cancer Center in Honor of Late Sister Tatiana.Jack Schlossberg/Instagram

“The Swim Across America mission is to award grants to innovative cancer research, clinical trials, detection and patient programs through charity swims that unite communities in the fight against cancer,” according to the organization’s mission statement.

Prior to her death, Tatiana penned an emotional essay published by The New Yorker about being diagnosed with acute myeloid leukemia. In the essay, she also criticized her cousin, Secretary of Health and Human Services Robert F. Kennedy Jr., for slashing government funding for cancer research.

Schlossberg received her diagnosis following the birth of her second child with husband George Moran in May 2024. She criticized RFK Jr.’s anti-vaccine stance and decision to defund various medical research initiatives, potentially impacting thousands of cancer patients.

“During the CAR-T treatment, a method developed over many decades with millions of dollars of government funding, my cousin, Robert F. Kennedy, Jr., was in the process of being nominated and confirmed as the secretary of health and human services,” she wrote in her New Yorker essay. “Throughout my treatment, he had been on the national stage: previously a Democrat, he was running for President as an Independent, but mostly as an embarrassment to me and the rest of my immediate family.”

“Suddenly, the health-care system on which I relied felt strained, shaky,” she continued in the essay. “Doctors and scientists at Columbia, including George, didn’t know if they would be able to continue their research, or even have jobs. (Columbia was one of the Trump Administration’s first targets in its crusade against alleged antisemitism on campuses; in May, the university laid off a hundred and eighty researchers after federal-funding cuts.).”

Caroline Kennedy with her children Jack Kennedy Schlossberg and Tatiana Kennedy Schlossberg on December 2, 2022 in Boston, Massachusetts.
Caroline Kennedy with her children Jack Kennedy Schlossberg and Tatiana Kennedy Schlossberg on December 2, 2022 in Boston, Massachusetts.ANGELA WEISS/AFP via Getty

Jack recently opened up to PEOPLE exclusively in June about his close bond with his sister as he campaigned to represent New York’s 12th Congressional District. At the time, he said that he knew “for a fact” Tatiana would be proud of him “because I talk to her every day.”

He added that while it was “really hard” to campaign after losing his sister just months ago, “she wanted me to make sure that I was gonna fight back as hard as I possibly could.”

“I’m fighting for her and with her by my side every single day,” Jack added.

Schlossberg ultimately lost his Congressional race to Assemblyman Micah Lasher, who secured the Democratic nomination for the seat on June 23.

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