It happened around 2 p.m. Tuesday on Beverly Rancocas Road near Primrose Lane.
Police say the vehicle went off the road and struck a tree.
The boy was pronounced dead at the scene.
His father and his 4-year-old brother suffered non-life-threatening injuries. They were taken to the hospital for treatment.
Crews used a crane to lift the wreckage from the trees.
The Burlington County Prosecutor's Office is investigating.
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