In February, Pitt's Once Upon a Time in Hollywood co-star, Margot Robbie, read a pre-written acceptance speech on behalf of the actor when he was announced as the winner of the Best Supporting Actor statuette at the annual awards show.
On Monday, a source told ET that the reason for Pitt's BAFTAs absence was that he was supporting Zahara after she underwent an operation. Page Sixwas first to report that Pitt missed the awards to be with one of his daughters following surgery.
"I have spent the last two months in and out of surgeries with my eldest daughter [15-year-old Zahara], and days ago watched her younger sister go under the knife for a hip surgery," Jolie wrote. "They know that I am writing this, because I respect their privacy and we discussed it together and they encouraged me to write. They understand that going through medical challenges and fighting to survive and heal is something to be proud of."
While Jolie didn't mention any specific names in the article, only referring to her eldest daughter, Zahara, ET has learned that Shiloh, 13, was the other daughter who underwent surgery. Jolie indicated that Shiloh was still in recovery from her procedure, stating that she was writing her editorial piece for Time from the hospital.
Jolie and Pitt, 56, are also parents to Maddox, 18, Pax, 16, and 11-year-old twins Knox and Vivienne.
In her essay, Jolie shared how her daughters attentively cared for each other during their health hurdles, while her sons were also "supportive and sweet."
"I have watched my daughters care for one another," she wrote. "My youngest daughter studied the nurses with her sister, and then assisted the next time. I saw how all my girls so easily stopped everything and put each other first, and felt the joy of being of service to those they love."
"I also watched them face their fears with a resolute bravery," Jolie continued. "We all know that moment when no one else can help us, and all we can do is close our eyes and breathe. When only we can take the next step or breathe through the pain, so we steady ourselves and do it. Their brothers were there for them, supportive and sweet. But on this International Women’s Day, writing from the hospital, I find myself focusing on my daughters for a moment, and all that I have learned from them and other young girls I have met around the world."