Jack Schlossberg and his sister Tatiana Schlossberg shared a close relationship until her passing on December 30 at age 35 after battling acute myeloid leukemia. The JFK Library Foundation announced her death via Instagram, stating: “Our beautiful Tatiana passed away this morning. She will always be in our hearts,” signed by family members including her parents Caroline Kennedy and Edwin Schlossberg.
Tatiana revealed her terminal diagnosis in a November New Yorker essay, explaining that doctors discovered the condition in May 2024 shortly after she welcomed her second child with husband George Moran. They gave her approximately one year to live. Jack, who is pursuing a Congressional seat, showed public support by sharing an Instagram Story featuring philosophical text: “Life is short – let it rip,” alongside excerpts from her essay titled “A Battle With My Blood.”
In her moving essay, Tatiana acknowledged her family’s unwavering support, writing: “George did everything for me that he possibly could… My parents and my brother and sister too have been raising my children and sitting in my various hospital rooms almost every day.” She described striving to be “a good sister and a good daughter” throughout her life.
The siblings shared common bonds as grandchildren of President John F. Kennedy and Jacqueline Kennedy Onassis. Both attended Yale University – Jack studied history with a Japan focus while Tatiana edited the Yale Herald before earning a master’s in U.S. history at Oxford University. They connected with their family legacy through historical study, with Tatiana telling Vanity Fair she explored eras that fascinated her grandparents.
Jack maintains ties to Tatiana’s legacy through her two young children. During a 2022 Today show appearance celebrating his nephew Edwin’s birth, Jack humorously noted: “I like to call him Jack,” demonstrating his ongoing family connections following his sister’s passing.