Jack Schlossberg, the grandson of former American President John F. Kennedy, is set to host a swimming fundraiser in memory of his late sister, Tatiana Schlossberg, who tragically passed away from acute myeloid leukaemia at the age of 35 in December 2025. The event will take place on July 18 and aims to raise funds for the Martha’s Vineyard Cancer Center, supporting innovative cancer research and patient care.
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In an Instagram Stories post dated July 14, Jack, who is now 33, announced the initiative to his followers. He shared his determination to honour Tatiana’s memory and called upon his community to participate, inviting them to either donate or take part in the swim. The emotional post featured nostalgic photographs, including one of Jack alongside their mother, Caroline Kennedy, and a vibrant image of Tatiana showing off her strength by flexing her arms in the water, harking back to their shared family moments.
The fundraiser is part of a broader effort by Swim Across America, an organisation dedicated to uniting communities through charity swims to provide grants that fund cancer research, clinical trials, and support programmes for patients. The mission resonates with the Schlossberg family, especially given Tatiana’s poignant experiences with cancer treatment and her advocacy for increased funding for medical research.
Before her passing, Tatiana authored an impactful essay published in The New Yorker, reflecting on her diagnosis and treatment for acute myeloid leukaemia. In her heartfelt writing, she voiced her frustration towards her cousin, Robert F. Kennedy Jr., who, as Secretary of Health and Human Services, had been associated with cuts to government funding for cancer research at a critical time for patients like herself.
Tatiana received her diagnosis soon after welcoming her second child with her husband, George Moran, in May 2024. In her essay, she expressed concern over the implications of RFK Jr.’s anti-vaccine stance and the potential consequences for scientific research vital to cancer patients, stating, “The health-care system on which I relied felt strained, shaky.”
Her reflections highlighted the precarious state of research funding, noting how government cutbacks had put the careers of many researchers and medical practitioners at risk. Tatiana’s experience in the healthcare system during her illness served as a rallying cry for more support and awareness regarding vital funding for cancer research initiatives.
Jack Schlossberg has also been candid about his grief and his commitment to honouring Tatiana’s legacy. Earlier this year, he spoke to PEOPLE about his close relationship with his sister and how her spirit continues to inspire him. He shared that he often feels her presence as he navigates his own public life, stating, “I talk to her every day. I’m fighting for her and with her by my side every single day.”
Although Jack recently faced a setback in his political career after losing the race for New York’s 12th Congressional District, he remains determined to channel his sister’s memory into advocacy. He believes that Tatiana would be proud of his efforts and the fight for better healthcare policies.
The upcoming fundraiser on Martha’s Vineyard represents not only a tribute to Tatiana’s life and struggles but also a significant community effort to enhance cancer research and support for those affected by the disease. As the date draws near, supporters are being encouraged to engage in this noble cause, either through participation in the swim or by making donations to the Martha’s Vineyard Cancer Center.
In remembrance of Tatiana Schlossberg and in support of the vital work being done to combat cancer, this event serves as a poignant reminder of the challenges faced by patients and their families in the ongoing battle against this devastating illness.