We have a very smart 51/2 year old son,he has a great imaganation,plays well with other children and is good in kindergarten(when we can get him to go).Our problem is he just won't listen,throws things and he's getting aggressive hitting and kicking mainly my wife and I,but sometimes his 3 year old sister.My wife thinks that since this has really has gotten worse since school started that it's because there are mentally handicapped children in his class that get's the majority of the teachers attenion,so he acts that way at home to get more attenion.We have tried to explain that those children have a problem with there brains and that's why they act the way they do and that he is normal and does not need to act up to get attenion.We have tried grounding,taking toys away,time out,spanking but all that does is makes matters worse and he gets more aggressive.We had him tested for add and he tested ok.My wife wants to put him in another school without mentally hanicapped children or home school him,but I don't think that the right answer.So I am looking for some advise,both my wife and I are about to loose our minds. Can anybody Help us?