DD is showing signs of unacceptable behaviour - she is basically copying her brother and doesnt realise it is wrong. What can I do to make her understand at 23 months that ds2 is different and she can't behave the same way? The paed says I need to nip it in the bud. I thought I would be best to sort it when ds2 goes to school in September so it gets my full attention iyknwim but she is getting really hard work.