Los Angeles, Aug 26:  Hollywood couple Brad Pitt and Angelina Jolie are reportedly seeking a therapist to help their oldest son Pax cope with aggressive behaviour.

The couple, who raise six children together, said to have found Pax bullying his siblings.

"He's become something of a bully. He picks on Shiloh, and even his big brother, Maddox. He's having a tough time getting along with his siblings," showbizspy. com quoted a source as saying.

"He's having a difficult time with the constant schedule changes and with the fact that people stare at him whenever he's with his parents," the source added.(IANS)