At about 1:30 p.m., the father and son were getting out of their vehicle when someone in a four-door sedan drove up and fired multiple shots in the vehicle.
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They had just returned home to the 14600 block of Des Plaines Street, according to a statement from Harvey Police Chief Gregory Thomas.
The 10-year-old was in intensive care at Christ Medical Center in Oak Lawn, Thomas said.
The father was not injured.
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Harvey police continued to investigate Saturday evening.
Bullets from the shooting hit a nearby house and vehicle.