Jaden Smith: Parents Will & Jada Favor Lil Sis

updated 06/08/2010 AT 7:35 AM ET

originally published 06/08/2010 AT 1:20 PM ET

Will and Jada Pinkett Smith’s son Jaden may know how to throw a mean blow in The Karate Kid remake, but in real life, he’s often the one under attack.

“Jaden’s a good kid, [but] he’s always bullied by his sister,” Smith’s costar Jackie Chan told PEOPLE with a chuckle at the L.A. premiere for their film Monday.

“I scream for my mom,” Smith, 11, says of his 9-year-old attacker. “She usually takes Willow’s side. My dad takes Willow’s side, too. That’s why I usually hang out with my brother [Trey]. I don’t bully anyone.”

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