Jack Schlossberg Reveals the Last Thing His Late Sister Tatiana Told Him Before She Died After Cancer Battle

John F. Kennedy’s grandson Jack Schlossberg is revealing the last thing his sister Tatiana Schlossberg said to him before she died at the age of 35.

“I can tell you that she’s still rooting for us and the last thing she said to me was, ‘You better win,” Jack, who announced his candidacy for the Democratic primary in New York’s 12th Congressional District one month before his sister’s death, told CBS Sunday Morning’s Mo Rocca in an interview shared on Sunday, March 1.

“No one knew me better and I knew no one better than her,” Jack continued.

When asked what it was like “growing up with two older sister,” the congressional hopeful admitted that it was “brutal.”

“Absolutely brutal — they don’t let you get away with anything,” Jack added. “My style was never good enough, I’ve never gotten an answer right in my entire life. But in all honesty, they’ve taught me everything I know about how to be a smart person and it’s also made me more conscientious and aware of my own privilege and position as a man in a world that often rewards certain type of behavior of certain people.”

Tatiana died on December 30, 2025, after she was diagnosed with acute myeloid leukemia and given a year to live.

“Our beautiful Tatiana passed away this morning. She will always be in our hearts,” The JFK Library Foundation shared in a statement via Instagram at the time, signed by Tatiana’s husband, George Moran, their two children, Edwin and Josephine, her parents, Edwin Schlossberg and Caroline Kennedy, her siblings Jack and Rose Schlossberg, and her sister-in-law, Rory Schlossberg.

Prior to hear death, the author and former science and climate writer for The New York Times penned a moving essay for The New Yorker, detailing her diagnosis.

“I did not — could not — believe that they were talking about me. I had swum a mile in the pool the day before, nine months pregnant. I wasn’t sick. I didn’t feel sick. I was actually one of the healthiest people I knew,” she wrote. “I had a son whom I loved more than anything and a newborn I needed to take care of.”

On Sunday, Jack showed the pictures of his late sister that he keeps on a nightstand near his bed in his small New York City apartment.

“This is a picture of me and Tatiana, my sister — my late sister. Us as kids and then at her wedding,” he said, showing the reporter the photographs in a dual frame. “Her wedding was in Martha’s Vineyard at my family’s house, my grandmother’s house there. And, uh, yeah it was awesome and her husband George is awesome.”
The reporter admits that only the campaign trail can pull him away from Tatiana’s young children, his beloved niece and nephew.

“When a baby is crying, it’s because they’re tired, hungry or sick…” Rocca said while speaking to Jack, who says he’s the “best” kind of uncle.

“Or they miss uncle Jack,” he interjected. “A lot of people don’t know that one.”

“We’re a really close family,” he continued. “For me, when you talk about the Kennedy family, it’s a lot of people I don’t know. When you talk about what family is, it’s me, my sisters, my parents — we’re a unit and we’re really close.”