Already K, still dont know that his parents are Chinese? A lot o

here already go to chinese school at k or preschool. Dont blame the two kids. I think they are good friends. That Japanese kid may not know your son is chinese, even your son doesnt know himself : ) How would you expect the Japanese kid know? Always be nice to kids at this age, but do tell them not to call anybody rat. Tell them that is called "being respectful".