DS2, aged 5. Took him to a swing park today and he was on the swings going really high, happy as Larry. A toddler- I'd say between 2 and 3- ran in front of the swing and to his dismay was walloped as my son hit her. Her mum runs over when she hears the screams and shouts at my son about being 'careful when there are little one's around'. I told her it was her responsibility, not Ds.