This week's columnist Tim Gill says we need sometimes to leave children to sort out their own differences 'Dad, those boys are bullying us,' said my eight-year-old daughter. We were at a park enjoying the sunshine, and she and a friend were searching for treasure. The three boys in question (all under five, none of whom we had met before) had spotted them and had been trying to wind the girls up by sing-saying, 'we can see your treasure, we know what you're doing'.