The Tacoma News Tribune reported that the boy told social worker he wasn't allowed to attend school because "he told somebody he gets beat at home."
The boy told social workers his mother, Maria Isler, and grandparents, Rosa and Robert Isler, kept him locked in a basement so he couldn't sneak food, and they beat him with spatulas, hangers and pieces of wood.
The trio pleaded not guilty Friday. Bail was set at $100,000 each for Maria and Rosa Isler, and $150,000 for Robert Isler.
Authorities said the boy had already been removed from the home in June.
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