my soon to be 7 year old daughter has recently started lying and doing thing to get her younger three year old brother in trouble,like throwing something at him when she thinks no ones watching so that he does something back and she can tell on him and get him told off!!We have had variouse occasions and i am not sure why or how to deal with it.When i ask her why she says she doesnt know and then crys and says she wont do it again but next day it will happen again!I am worried as she has always been a well behaved child and this behavior seems very strange.