Brad Pitt is concerned that his children with Angelina Jolie will tell their side of the story in the future, according to a source.

Jolie and Pitt share six children -- Maddox, 22, Pax, 20, Zahara, 19, Shiloh, 18, and 15-year-old twins Knox and Vivienne. Most of them have shown their support for their mom, with their three girls dropping Pitt's surname. The "Bullet Train" actor is allegedly worried that they will do a tell-all interview in the future and compound his misery.

"This is a dark cloud hanging over Brad's head. He can muzzle Angelina with his lawyers, but he can't muzzle his own kids," an unnamed source told In Touch.

Brad Pitt and Angelina Jolie's kids
 (L-R) Maddox Jolie-Pitt, Vivienne Jolie-Pitt, Angelina Jolie, Zahara Jolie Pitt, Shiloh Jolie-Pitt, and Knox Jolie Pitt arrive at the Premiere of Marvel Studios' Eternals on October 18, 2021 in Hollywood, California. Jesse Grant/Getty Images for Disney

"They've stayed totally quiet so far, but at some point down the line, it's very plausible that they're going to want to tell their side of the story. There's nothing to stop them from doing it. And when they decide to go ahead and talk, Brad will just have to sit back and take it."

The tipster claimed that if this would happen, it would be the "Once Upon a Time in Hollywood" star's "worst nightmare." However, at present, all he can do is get on with his life and put the thought of his kids talking about their family issues out of his mind.

"If these kids eventually do want to turn around and get the ultimate closure by laying it all out in the open and telling the world what they've been through, it's going to be Brad's worst nightmare and no doubt will be the ultimate humiliation for him," the source continued.

Brad Pitt
Brad Pitt (C), (L-R) Pax Thien Jolie-Pitt, Shiloh Nouvel Jolie-Pitt,, Maddox Jolie-Pitt, Jane Pitt, and William Pitt arrive at the Premiere Of Universal Studios' "Unbroken" at TCL Chinese Theatre on December 15, 2014 in Hollywood, California. Frazer Harrison/Getty Images

"He's in a very tough spot because it's not like he can even try and talk to them about it because that could only make things worse. So all he can do is wait for the hammer to drop and try to put it out of his mind."

The insider, however, added that Jolie would not encourage the children to do it. Jolie also allegedly "insisted" that it was Zahara, Shiloh and Vivienne who "made their own minds up" in removing their dad's last name.

Of Pitt and Jolie's children, their eldest biological child, Shiloh, was the first to file legal papers to drop Pitt's last name officially. She made the filing in May when she turned 18. An unnamed source told Entertainment Tonight that Shiloh "hired her own lawyer and paid for it herself."

Shiloh Jolie-Pitt
Shiloh Jolie-Pitt attends the Los Angeles premiere of MSNBC Films' "Paper & Glue: A JR Project" at Museum Of Tolerance on November 18, 2021 in Los Angeles, California. JC Olivera/Getty Images

Meanwhile, an unnamed source told People that Pitt was "aware and upset" with Shiloh's move. His strained relationship with his kids reportedly "pains him."

"The reminders that he's lost his children, is of course not easy for Brad. He loves his children and misses them. It's very sad," the insider added.

Brad Pitt and Angelina Jolie
Oscar-nominated actors Brad Pitt and Angelina Jolie arrive at the 81st Academy Awards at the Kodak Theater in Hollywood, California on February 22, 2009. ROBYN BECK/AFP via Getty Images
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Brad Pitt, Angelina Jolie