Article continues below advertisementJack Schlossberg got candid about one of the last conversations he had with his late sister, Tatiana, before she passed away.Tatiana died on December 30, 2025, at the age of 35 - just over a month after she announced she was diagnosed with acute myeloid leukemia.Article continues below advertisementJack Schlossberg Opened Up About His Dear Late Sister Tatiana Source: @CBSSunday/XJack Schlossberg got candid about one of the last conversations he had with his late sister. On March 1, the grandson of John F.