Angelina Jolie and Brad Pitt’s eldest son Maddox Jolie-Pitt has reportedly testified in the former couple’s divorce trial and has said not “very flattering” things about his father.

“Maddox has already given testimony as [an] adult in the ongoing custody dispute, and it wasn’t very flattering toward Brad,” an “inside” source told Us Weekly on Thursday. “He doesn’t use Pitt as his last name on documents that aren’t legal and instead uses Jolie. Maddox wants to legally change his last name to Jolie, which Angelina has said she doesn’t support.”

The report comes hours after Jolie reportedly told the court that she will offer “proof” at trial to support her claims of domestic violence against ex-husband. Court filings, submitted last week, indicate that Jolie and her children are willing to offer “proof and authority in support” of the abuse claims. Reports further said that Jolie said she is prepared to detail her negative experiences with Pitt, during their 10-year relationship and two-year marriage.

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Jolie and Pitt have six children. Besides, 19-year-old Maddox, there is Pax, 17, and Zahara, 16, Shiloh, 14, and twins Knox and Vivienne, 12.

Jolie, 45, and Pitt, 57, have been embroiled in a bitter custody and divorce battle since Jolie filed for divorce in September 2016, ending their jet-setting, movie star lifestyle together that made them one of Hollywood’s superstar couples.

Soon after the couple’s split, it was revealed that Pitt was being investigated by the FBI and child welfare services in Los Angeles, related to reports he got “verbally abusive and physical with his children” on a private jet returning from Europe. A number of reports claimed that Maddox was the main focus of Pitt’s aggression on the flight. However, the Los Angeles County Department of Children and Family Services cleared Pitt in November 2016 after investigating the actor.