When your children are baited in the school, what will you do?

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My nephew do not want to go to the school now, for he is baited by the classmates. His parents want to do something to help him, but they do not know how to do it. When i was a pupil, I had been baited by the biggest boy in my class for a long time. I did not tell my parents about that, but tried to fight back. And when i was in the grade three, I had a great chance to fight back, I kicked that boy and he was hurt badly. Then all problems were solving by the way, I can lead a peace life in the next years. But now, I think that is not the best way to solve problem. Using force is not a good choice, but I do not know how to solve the problems in a polite and useful way. But I do not think i can teach my nephew in that way, though it seems a solution. His parents think give some gifts to his teachers and he may get help from his teachers. But I do not think it is a good way. Though it can solve the problem, it may make my nephew depend on other people to solve his problem not by himself. In your opinion, what you will do in that case?