I'm not sure exactly what they do as "punishment" at home but I told her what I do (timeout in a pnp away from all the other children). I know it is the age, but it sucks since the other children are getting hurt. He almost broke skin yesterday when he bit my sons thumb (I looked away for one minute). I guess I will shadow and keep doing what I'm doing and hopefully this passes quickly. I will suggest to the mother to do my procedure of timeouts so that it is consistent and hopefully they work with me. Thanks everyone!