To sign or not to sign!

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My 8 year old grandson has a classmate who is very naughty and used to bully his classmates and hit them with out any reason. I am trying to convince my grandson to understand him and be compassionate enough for the boy, because their might be a problem in the home. I tried to talk to the boy and ask why he always bully and hit his classmates, but he became so defensive. I tried to ask the teacher what is going on with the family and she said that they don't have a father and the mother comes home late. I tried to understand the situation of the child but I was approach by the teacher and told that the parents are writing a petition to transfer the boy to another school because he is dangerous to his classmates. The teacher ask me if I will sign or not. What will I do? I pity the child but I am also thinking about the welfare of the classmates. Help!!