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The boy went missing for nearly two weeks last summer before being found in the family's basement.
His father, Charlie Bothuell IV, and stepmother, Monique Dillard-Bothuell, are charged with torture and child abuse. They deny the charges and insist they didn't know the boy was in the basement.
Prosecutors say the boy was struck with a plastic pipe, forced to perform rigorous workouts and given a limited diet.