Angelina Jolie and Brad Pitt may seem like the perfect parents, but a report suggests their rainbow brood are far from well-behaved.

Six-year old Maddox is always pushing around four-year old Pax to show him who’s boss, but it’s three-year old Zahara who is causing the most trouble according to Star magazine.

A source tells the publication: "She screams and shouts at the boys when she doesn't get her way."

Even 22-month old Shiloh is being bullied by her older sister. "Z is always pushing or scratching her."

The motive for such attacks is usually food. The insider confides: "Z once clawed Shiloh's cheek after she tried to take her cookie. She's always pulling on Shiloh's hair so she can steal her food."

Young Shiloh’s chipped tooth is the result of such rough shenanigans, the source adds. "Angie gets worried when Shi plays with them. She always comes back with a scraped knee or a fat lip!"

A reason for the Jolie-Pitt children’s bad behaviour could be their poor diet, believes the source who adds: "They eat fast food, pizza, chips and sugary soft drinks. Brad and Angie let them eat what they want because it brings harmony to the chaotic household."

To make matters worse, the insider concluded: "Because bedtime is whenever the kids feel like it, they get overly tired and cranky. Brad and Angelina don't like to be too strict."