Brad Pitt, 47, and Angelina Jolie, 36, have had to seek professional help to deal with their seven-year-old son, Pax. A therapist has been hired to help the boy control his aggression. “He’s become something of a bully,” a family insider told In Touch Weekly. “He picks on [5-year-old] Shiloh, and even on his big brother, Maddox. He’s really having a tough time getting along with his siblings.” Jolie adopted Pax in 2007, when he was three, unlike her other adopted children, Zahara, 6, and Maddox, 10, who were adopted when they were babies. The magazine speculates that Pax’s behavioral problems may stem from his difficult, early life in a Vietnamese orphanage. When he was younger, Angelina admitted that Pax had trouble adjusting to his new life, saying, “We’re slowly beginning to build his trust. It will take him a while to realize he has a family.” However, his current situation as the child of a high profile celebrity couple may also be a factor. “He’s having a difficult time with the constant schedule changes,” the insider revealed, “and with the fact that people stare at him whenever he’s with his parents.” Jolie also has three-year-old biological twins with Pitt — Knox and Vivienne.