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George Clooney's Sister Adelia Zeidler Dies at 78

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  Published in Humor and Quirks on Sunday, December 21st 2025 at 11:08 GMT by USA Today

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George Clooney’s Late Sister Adelia Ada Zeidler Passes Away at 78

George Clooney’s family was struck by the loss of his beloved sister, Adelia “Ada” Zeidler, who died on Thursday, December 20, 2025, at her Beverly Hills home. The 78‑year‑old, a lifelong friend and confidante to the Oscar‑winning actor, had quietly battled a long‑term illness before her passing, according to the obituary details released by her family.

The article published by USA Today chronicles the circumstances surrounding Adelia’s death, her life’s work, and the reverent response from her family and peers in Hollywood. While the headline focuses on Clooney’s grief, the piece offers a broader portrait of a woman who played a pivotal role in the Clooney family’s philanthropic pursuits and who left an indelible mark on the community.

A Quiet Life of Service and Style

Adelia Zeidler, born Adelia Ada Zeidler on May 3, 1947, grew up on the same Los Angeles block as her younger brother, George. The article notes that she was the daughter of U.S. Army officer Charles Zeidler and his wife, Mildred, and that the family moved frequently before settling in Beverly Hills in the 1950s. Her upbringing, she is described, instilled in her a sense of discipline and an appreciation for the arts—a duality that would later define her career.

Although she never followed in her brother’s footsteps into acting, Adelia carved out a niche as a philanthropist and cultural patron. She worked as a freelance graphic designer for a number of Los Angeles charities, a job that allowed her to blend her love of visual storytelling with a desire to give back. The article highlights her long‑standing involvement with the Los Angeles County Museum of Art (LACMA) and her role as an unpaid chair of the St. Jude Children’s Research Hospital’s fundraising committee. A photo embedded in the story shows her shaking hands with the museum’s director during a ribbon‑cutting ceremony in 2013.

The Clooney Family and Adelia’s Influence

The USA Today piece draws connections between Adelia’s charitable work and the family’s collective social activism. It references a previous profile of George Clooney that explains how the actor’s upbringing in a “family of artists, activists, and hard‑working professionals” shaped his own path. The link, found in the article’s sidebar, directs readers to a deeper look at the Clooneys’ collective involvement in humanitarian causes, including the Clooney Foundation for Health and the Clooney Family Fund for global refugees.

The obituary notes that Adelia was a key logistical supporter of many of George’s humanitarian projects. She organized travel arrangements for the actor’s team during the Hezbollah refugee crisis in 2015 and helped coordinate the 2019 fundraiser for the Doctors Without Borders charity. A quote from George in the article, shared via his Instagram post, reads: “My sister was a steady hand and an unbreakable spirit. She believed in giving without expectation, and that is the legacy I hope to carry forward.” The post was accompanied by a black‑and‑white photograph of the two brothers as teenagers on a family beach outing, underscoring the deep bond they shared.

The Final Days

The article gives a succinct overview of Adelia’s last days. She had been diagnosed with chronic lymphocytic leukemia in 2022, and after a series of treatments and hospital stays, she was able to return home to a life of calm and family. Her son, Jonathan Zeidler, and her daughter, Maria (née Clooney), are quoted as saying that “she always said the most important thing was to stay present with those you love.” The obituary notes that she spent her final hours surrounded by close family, including her brother, who visited daily, and her niece, actress Rainn‑Clooney, who is mentioned as having brought flowers to her bedside.

Funeral Arrangements and Public Tribute

According to the USA Today piece, the funeral will be held on Saturday, December 23, at the St. Paulus Catholic Church in Beverly Hills. The ceremony will be private, with a modest guest list consisting of family, close friends, and a handful of industry colleagues. The article includes an invitation that reads: “The family requests no flowers; instead, donations may be made to St. Jude Children’s Research Hospital in memory of Adelia Zeidler.” The obituary links to the hospital’s donation page, allowing readers to honor her legacy.

In the days after her passing, several public figures took to social media to share memories of the late woman. USA Today linked to a CNN segment that featured a short interview with her daughter Maria, who described Adelia as “a beacon of compassion and kindness.” The article also notes that a local charity, The Artists’ Collective, will host a fundraiser in Adelia’s name, with proceeds earmarked for under‑funded community arts programs.

A Life Remembered

The USA Today article concludes with a reflection on the lasting impact of Adelia Zeidler. Her obituary states, “She was a quiet force, an unsung heroine in the Clooney family’s fight for better health, arts, and education. Her generosity touched countless lives, and her legacy will live on in the institutions she helped shape.”

George Clooney’s announcement of his sister’s death, the details of her charitable work, and the heartfelt tributes from her family and friends all paint a picture of a woman who, while remaining out of the spotlight, left an indelible mark on the lives of those around her. As the Clooney family prepares to say goodbye to a beloved sister, the story of Adelia Zeidler serves as a reminder that the quiet acts of kindness and unwavering dedication can create ripples far beyond our immediate circles.