George Washington cannot tell a lie. But according to developmental psychologists, your child can. Lying is developmental. Young children lie when they acquire certain cognitive skills that demonstrate they understand another person's point of view. That is, around three years old, your child discovers what YOU want him to say - the right answer that won't get him in trouble.
Preschool age children are not "rational" thinking in the adult sense of the word. They are capable of magical thinking (story characters who will come to birthday parties, fairy dust to help them sleep, and cars that don't start if your seat belt isn't on) and they use "kid-logic" that allows them to hold contradictory beliefs (for example the tantruming 4 year old who wants to go to school with her friends and stay home with her favorite aunt - one or the other just won't do).
Children grow out of "magical thinking" as they mature into school-age. That's when they are capable of distinguishing right from wrong and capable of "moral reasoning". Moral reasoning involves higher-ordered concepts of empathy, self control, rule-governed behavior, and predicting outcomes. Moral reasoning also involves evaluating degrees of "rightness" - when a lie might be better than the truth, for example.
Here are some helpful parenting tips to use when your child is likely to tell a lie:
George Washington may have never told a lie but I'll bet he told a great story!