Getty Jack Schlossberg is opening up about the death of his sister Tatiana. If you were unaware, Tatiana died in December 2025 after a battle with cancer. She was 35. While speaking with Vanity Fair, Jack, 33, admitted that he doesn't think he'll ever process his older sister's death. "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," Jack said. "She was my best friend. We could finish each other's sentences," he continued. "I miss her all the time. Every day I think about her.