This is DS1(4)'s favourite expression at the moment. He says it with great enthusiasm at DS2 (15m), whenever DS2 does something he doesn't like.
I don't like saying "naughty". I try to criticise the behaviour, not the child, etc etc.
So how do I stop my 4 year old from disciplining my toddler, inappropriately? (And how do I keep from cracking up while doing it?)