Maddox Jolie-Pitt always wants to protect his mom, Angelina Jolie, according to an insider.

In September 2016, Jolie and Brad Pitt had an altercation during a flight from France to Los Angeles. She alleged that he was abusive, and during the physical brawl, Pitt allegedly "choked" one child and hit another in the face. An unnamed source said that following the fight that led to the former A-list couple's split, Maddox wanted to be their mom's protector.

"Maddox was very affected by that incident, and he's taken it upon himself to be Angelina's protector," the source told OK! Magazine.

Angelina Jolie and kids
 Angelina Jolie with children Knox Leon Jolie-Pitt, Vivienne Marcheline Jolie-Pitt, Pax Thien Jolie-Pitt, Shiloh Nouvel Jolie-Pitt, Zahara Marley Jolie-Pitt and Maddox Chivan Jolie-Pitt attend "The Boy Who Harnessed The Wind" Special Screening at Crosby Street Hotel on February 25, 2019 in New York City. Monica Schipper/Getty Images for Netflix

Maddox is Jolie and Pitt's eldest child. The former celebrity couple share six children -- Maddox, 22, Pax, 20, Zahara, 19, Shiloh, 18, and twins Knox and Vivienne, 15. Maddox, whom Jolie adopted from Cambodia even before she started dating Pitt, allegedly had negative opinions of his adoptive father, and it allegedly "rubbed off on" his younger siblings, especially on Pitt's biological daughters, Shiloh and Vivienne.

Another insider claimed that Shiloh's recent decision to drop her dad's surname from her legal name was "connected" to the alleged "abuse history" of their dad.

"She [used to be] very close with Brad and his family, but that relationship [changed] in recent years," the insider explained.

Vivienne Jolie-Pitt
(L to R) Shiloh Jolie-Pitt, Zahara Jolie-Pitt, Angelina Jolie, Vivienne Jolie-Pitt, Maddox Jolie-Pitt and Knox Jolie-Pitt attend the "Eternals" UK Premiere at the BFI IMAX Waterloo on October 27, 2021 in London, England. Tim P. Whitby/Getty Images

A third insider claimed that the twins -- Vivienne and Knox -- are feeling the same way. Vivienne even chose to drop Pitt's last name from the playbill of "The Outsiders," which she worked on with her mom.

"They used to have Facetime calls when they were apart and he was much more involved in their lives," the third source said of the twins. "The dynamic has shifted."

The FBI and the Los Angeles County Department of Children and Family Services investigated the in-flight altercation in 2016. Two months later, the FBI dropped the investigation, and Pitt was not charged. The LA County Department of Children and Family Services also cleared the "Once Upon a Time in Hollywood" actor of child abuse allegations, USA Today reported.

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

Last month, Shiloh reportedly filed legal documents to change her name to "Shiloh Jolie" on her 18th birthday. A source told Entertainment Tonight that she "hired her own lawyer and paid for it herself."

In 2021, another insider claimed to Us Weekly that Maddox also wanted to get rid of Pitt's surname. He allegedly no longer used Pitt as his last name on some documents that were not legal. He reportedly wanted to make it official, but Jolie wasn't supportive.

"Maddox wants to legally change his last name to Jolie, which Angelina has said she doesn't support," the source said.

Another tipster told People Pitt was "aware and upset" of Shiloh's decision. The move reportedly reminded him that he had "lost his children," and he missed them.

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
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Brad Pitt, Angelina Jolie, Maddox jolie pitt, Shiloh Jolie-Pitt, Vivienne jolie pitt