Jack Schlossberg says he'll never process sister Tatiana's death: 'She was my best friend'

Kennedy heir Jack Schlossberg, the son of President John F. Kennedy's daughter Caroline, lost his older sister, Tatiana, in December.

Key Points

• Tatiana Schlossberg, 35, died of cancer. The environmental journalist was a mother of two.

• Political candidate Jack Schlossberg said Tatiana was his best friend.

While Jack Schlossberg is focused on winning a seat in the U.S. House of Representatives, he can't stop thinking about his sister Tatiana's death.

"I don't think I'll ever process it," he toldVanity Fairin an interview published Friday. "The world will never be the same for me, not only since she passed away, but since she was diagnosed with cancer about two years ago."

Tatiana Schlossbergdied Dec. 30, after announcing in November 2025 that she had been diagnosed with cancer, acute myeloid leukemia, more than a year earlier. Doctors told her the prognosis was terminal.

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"She was my best friend. We could finish each other's sentences," Schlossberg, 33, said of losing one of his two sisters. "I miss her all the time. Every day I think about her."

Schlossberg has said previously that his sister had told him he "better win" in his campaign.

His grief has served as a motivation.

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"It's made me all the more motivated, engaged, and focused on making the most out of my life, and I think that there's no higher calling than public service," the grandson of PresidentJohn F. Kennedysaid. "To me, I think politics is a noble profession, and one that I would be fantastic at serving this district as. So she wanted me to win, and I intend to honor her by doing just that."

The proximity of Schlossberg's loss has shown him, he said, that "it could have just as easily been me."

He feels an obligation to himself and his sister "to make the most out of my precious life and all that I’ve been given in this life to give back to others and make sure that we can fund cures for the type of cancer that took her life, and for other types of cancer."

During Tatiana's life, she worked as an environmental journalist at theNew York Times. She published the non-fiction bookInconspicuous Consumption: The Environmental Impact You Didn't Know You Hadin 2019.

The emotional essay in which she disclosed her illness was published in theNew Yorker.

"Mostly, I try to live and be with them now," she wrote of her family, which included husband George Moran and their two children, Edwin and Josephine. "But being in the present is harder than it sounds, so I let the memories come and go. So many of them are from my childhood that I feel as if I'm watching myself and my kids grow up at the same time."

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