Watch: Jack Schlossberg Supports Sister Tatiana Schlossberg After Terminal Cancer DiagnosisJack Schlossberg is letting old prose express his family's unfathomable grief. Nearly a week after his sister Tatiana Schlossberg died Dec. 30 following a battle with myeloid leukemia, Caroline Kennedy's youngest child shared a collection of poetry and speeches, including one from his grandfather John F. Kennedy, pertaining to grief, loss and honoring those who came before us. "There are things in this life which are real: God, human folly and laughter," the quote attributed to Jack and Tatiana's grandfather, which Jack shared in his Jan. 5 Instagram post, read. "Since the first two are beyond our comprehension, we must do what we can with the third." Alongside the quotes, which also include lines from Abraham Lincoln's "Gettysburg Address," and Robert Frost's "Stopping by the Woods on a Snowy Evening," Jack included an old photo of himself with his late sister as young teenagers, smiling brightly with their hands over their hearts. The 32-year-old captioned his post with a simple cherry blossom flower emoji. readA Kennedy Family Guide: Tatiana Schlossberg, Jack Schlossberg, Caroline Kennedy & MoreJack's post comes less than a week after Tatiana's family-which also includes dad Edwin Schlossberg and sister Rose Schlossberg, 37, as well as Tatiana's husband George Moran and kids Edwin, 3, and Josephine, 15 months-confirmed her passing at just 35 years old. "Our beautiful Tatiana passed away this morning," the late environmental journalist's loved ones wrote in a statement. "She will always be in our hearts." Leading up to her tragic passing, Tatiana had opened up about her terminal prognosis, lauding her family for standing by her during such a difficult time. MANDEL NGAN/AFP via Getty Images"My parents and my brother and sister, too, have been raising my children and sitting in my various hospital rooms almost every day for the last year and a half," Tatiana wrote in the Nov. 22 essay published in The New Yorker. "They have held my hand unflinchingly while I have suffered, trying not to show their pain and sadness in order to protect me from it. This has been a great gift, even though I feel their pain every day." She continued to reminisce on how much she loved her life, and how painful it was to come to terms with it being taken away from her. "I trick myself into thinking I'll remember this forever, I'll remember this when I'm dead," she concluded. "Obviously, I won't. But since I don't know what death is like and there's no one to tell me what comes after it, I'll keep pretending. I will keep trying to remember." For more on the Kennedy family, keep reading...

Everett/ShutterstockJoseph P. Kennedy and Rose KennedyJoseph Patrick "Joe" Kennedy married Rose Elizabeth Fitzgerald on Oct. 7, 1914.

Bachrach/Getty ImagesBy 1932, they had nine children together: Joseph P. Kennedy Jr., John F. Kennedy, Rosemary Kennedy, Kathleen Kennedy, Eunice Kennedy, Patricia Kennedy, Robert F. Kennedy, Jean Kennedy and Edward Kennedy.

Keystone-France/Gamma-Keystone via Getty ImagesJoseph P. Kennedy Jr.

Born July 25, 1915, Joe Jr. was going to be president, as far as his father was concerned. He was a delegate to the 1940 Democratic National Convention and planned to run for Congress after he got out of the Navy. But the 29-year-old and his co-pilot Wilford John Willy were killed Aug. 12, 1944, when explosives they were carrying detonated prematurely while on a bombing run that was part of Operation Aphrodite. Neither pilot's body was ever recovered and their names are among those on the Tablets of the Missing at the Cambridge American Cemetery and Memorial honoring casualties of World War II.

Mikki Ansin/Getty ImagesJohn F. KennedyIt was John, born May 29, 1917, who made it to Congress, then became a U.S. senator and ultimately was elected president in 1960. He married Jacqueline Bouvier on Sept. 12, 1953, and they welcomed daughter Caroline Kennedy on Nov. 27, 1957, and son John F. Kennedy Jr. on Nov. 25, 1960. A daughter, Arabella, was stillborn in 1956 and son Patrick, born prematurely on Aug. 7, 1963, lived for only 39 hours. JFK was assassinated on Nov. 22, 1963, one of the defining events of the 20th century.

Tatiana, Jack, Rose, Edwin, Caroline (Clodagh Kilcoyne/Getty Images)Caroline KennedyCaroline, the U.S. ambassador to Japan during the Obama administration and to Australia for the Biden administration, married Edwin "Ed" Schlossberg in 1986. They share daughters Rose Kennedy Schlossberg (born June 25, 1988) and Tatiana Kennedy Schlossberg (May 5, 1990) and son John "Jack" Bouvier Kennedy Schlossberg (Jan. 19, 1993). TV producer Rose went to Harvard like her mom and married restaurateur Rory McAuliffe in 2022. Tatiana-a journalist who didn't know at the time that her 2014 New York Times article about a dead bear being found in Central Park involved her cousin RFK Jr.-graduated from Yale and married college sweetheart George Moran in 2