Correcting someone else's child is not your responsibility; creating positive play is. Intervene and direct your child to a different activity. In a calm and non-threatening way, explain this to either the child acting aggressively or to the child's parent if present.
What do you want the panelists to weigh in on? Email your ideas to editor Tamara O'Shaughnessy at tamara@chicagoparent.com.