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Question

How do I stop my step child from hurting my biological child?

What makes my step child, an 8 year old boy, choke my daughter, a 6 year old girl? This has been going on for 4 years. The boy tells my daughter not to tell on him. He knows it's wrong; we have did time out, spanking, taking away toys, and sitting on the wall. I am afraid for my daughters safety!