Sorry for long title, but we were at a playgroup today at a large leisure centre and am unsure how to deal with other children when they are being horrid to my dd on purpose. The other child pushed my dd away from 1 car she was playing with so she went to another. He followed her to the other & stopped her playing with that. When she walked away he got on the trike & rode into her so hard she fell over. I was so shocked I picked her up & left. Thinking about it now I don't want her to think that is acceptable behaviour but can you disipline other peoples children?? help please thank you