Brad Pitt maintains contact with his younger children but has ‘almost no contact’ with his adult children. Here’s the reason…

One month after Angelina Jolie and Brad Pitt’s 18-year-old daughter Shiloh petitioned to remove “Pitt” from her surname, a source close to the family tells PEOPLE that the actor has “virtually no contact” with his older children but still sees his younger children.

“He barely interacts with the adult children.” The insider claims that filming commitments have restricted his interaction with the younger children in recent months. Pitt is currently on site in Europe filming his forthcoming racing feature, F1.

Jolie, 48, and Pitt, 60, have six children: Maddox, 22, Zahara, 19, Shiloh, Pax, 20; and twins Knox and Vivienne, 15. The source also mentions that the couple’s custody arrangement includes visiting privileges for their minor children.

“[Angelina] has the kids most of the time, but per their agreement, he has visitation with the younger kids.”

A source close to Pitt recently told PEOPLE that the father of six is “aware and upset” about Shiloh’s name change. “He’s aware and upset that Shiloh dropped his last name,” the insider stated in June.

Brad clearly finds it difficult to remember that he has lost his children. He loves and misses his children. “It’s very sad,” said the source.

“He’s still happy with Ines [de Ramon],” the insider added, but the distance from his children “pains him.”

“He still loves all of his kids tremendously,” another close friend of Pitt told PEOPLE. “This whole process has been very hard for the whole family.”

Someone familiar with the situation reports that Shiloh submitted her paperwork on Monday, May 27, coinciding with her 18th birthday. The adolescent wants to change her legal name to “Shiloh Jolie.”

Shiloh isn’t the only Jolie-Pitt kid that appears to have a different name. According to PEOPLE, the adolescent is named “Vivienne Jolie” rather than “Vivienne Jolie-Pitt” on the Playbill for the new musical The Outsiders, which their daughter Vivienne assisted mother Jolie in producing.

At this moment, it is unclear whether Vivienne has also officially changed her name.