The shooting took place at about 10:46 p.m. in the 1100-block of North Kostner Avenue.
Police said the boy was with his mother in a car when a male suspect in a pickup truck fired shots.
The boy's father was in a dispute with the gunman before the shooting, police said.
The boy was transported to Stroger Hospital in good condition with a graze wound to the left leg, police said.
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No one is in custody and Area Four detectives are investigating.
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