Maria Shriver, niece of the late U.S. president John F. Kennedy, is supporting her family member Tatiana Schlossberg amid her terminal cancer diagnosis. "If you can only read one thing today, please make take the time for this extraordinary piece of writing by my cousin Caroline's extraordinary daughter Tatiana," Shriver, 70, wrote via her Instagram on Saturday, November 22 - the same day Schlossberg penned a moving essay for The New Yorker announcing she has been diagnosed with acute myeloid leukemia and given just one year to live. "Tatiana is a beautiful writer, journalist, wife, mother, daughter, sister, and friend," Shriver continued in the caption, which was accompanied by screenshots of the essay. "This piece is about what she has been going through for the last year and a half. It's an ode to all the doctors and nurses who toil on the frontlines of humanity. It's so many things, but best to read it yourself, and be blown away by one woman's life story." She concluded, "And let it be a reminder to be grateful for the life you are living today, right now, this very minute. Link to the full piece in my stories." Tatiana Schlossberg's Brother Jack Breaks Silence On Sister's Terminal Cancer Schlossberg - the daughter of Caroline Kennedy and Edwin Schlossberg - learned of her cancer diagnosis after she gave birth to her second baby, a daughter, in May 2024. (Tatiana and her husband, George Moran, who tied the knot in 2017, also share a 3-year-old son.) According to the author, her doctor noticed an imbalance in her white blood cell count, initially assuming the issue was related to her pregnancy or the result of a labor and delivery complication. The doctors later discovered that she has "a rare mutation called Inversion 3." "I did not - could not - believe that they were talking about me," Tatiana wrote in The New Yorker essay, published on Saturday. "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. I had a son whom I loved more than anything and a newborn I needed to take care of." Maria Shriver, Tatiana Schlossberg Getty Images Tatiana's brother, Jack Schlossberg, also showed his support for his sister on Saturday amid her devastating diagnosis. The aspiring politician - who is currently running for New York's 12th congressional district in a bid for Congress - shared a screenshot of the essay along with a link via his Instagram Stories. In a subsequent post, he shared a separate screen shot of the essay's opening paragraph. "When you are dying, at least in my limited experience, you start remembering everything," the paragraph reads. "Images come in flashes - people and places and stray conversations - and refuse to stop. I see my best friend from elementary school as we make a mud pie in her back yard, top it with candles and a tiny American flag, and watch, in panic, as the flag catches fire. I see my college boyfriend wearing boat shoes a few days after a record-breaking snowstorm, slipping and falling into a slush puddle. I want to break up with him, so I laugh until I can't breathe." In the essay, Tatiana also criticized her cousin, Robert F. Kennedy Jr., the current secretary of Health and Human Services who has made a name for himself by peddling conspiracy theories about the safety of vaccines. "In August 2024, he suspended his campaign and endorsed Donald Trump, who said that he was going to 'let Bobby go wild' on health,'" she wrote. "My mother wrote a letter to the Senate, to try and stop his confirmation; my brother has been speaking out against his lies for months. I watched from my hospital bed as Bobby, in the face of logic and common sense, was confirmed for the position, despite never having worked in medicine, public health, or the government." Tatiana Schlossberg Calls Out Cousin RFK Jr. While Announcing Her Cancer She continued, "Bobby is a known skeptic of vaccines, and I was especially concerned that I wouldn't be able to get mine again, leaving me to spend the rest of my life immunocompromised, along with millions of cancer survivors, small children, and the elderly." RFK Jr. has yet to publicly acknowledge Tatiana's essay, diagnosis or comments regarding his vaccine skepticism. In a previous interview with CNN, the current HHS secretary argued that the political differences that exist within his family are a common reality for millions of other Americans. "I have a big family," he said at the time. "I don't know anyone in America who's got a family who agrees with them on everything."