Many of us remember our parents’ reaction when we were caught in a lie or remember when our children told us a lie. It often comes as a shock to parents. The reality is that all children lie at some point. It’s a normal part of a development. As the American Academy of Pediatrics (AAP) explains, the act of lying demonstrates that their conscience is working. While it can be upsetting when kids lie or stretch the truth, the reasons they do so vary by age. And, how we react can make a big difference on their future behavior.