(Chicago Tribune) — It was a warm and sunny day outside, but Xavier Parker, 10, was deep into a computer game at Thurgood Marshall Public Library when his father walked in and told the boy he was about to go to a store.  “Stay in here,” Xavier’s father, Jimmy Giles, said, leaving the boy in charge of his 6- and 8-year-old brothers. “Don’t go anywhere until I come back and get you.”

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