My son has a friend in preschool and this friend is not liked by any other kid. This kid hits others. But not my son. He has even hit me when I've come to get my son from preschool! He cries when I arrive and races to the door. To be honest this attachment to my son worries me. I don't like how he is so attached to my son that he has trouble letting him go even with reassurance that my son will be there tomorrow! I've asked the teachers to talk to the other boys parents and there has been some improvement but not enough for me to feel comfortable yet! What more can I do?