3 yo ds keeps smacking - me, his gran, his baby sister, anyone close to him - often just to get a reaction. We've been trying the naughty step but sometimes he does it just to get a reaction and to be put on there (with 1 yo sister he often has to wait for our attention and this is a sure fire way to get it). I'm not inclined to ignore it - have tried to an extent but no joy anyway. What can we try?