Nathan is a little Kenny-emulator. He copies everything his big brother does.

Example: I ask Kenny to get dressed for bed. He does not want to go to bed, so he starts crying and pitching a fit. Nathan hears some commotion and comes running in with a grin on his face. He stops as soon as he gets to his brother. Nathan looks up at him for a few seconds, assessing the situation, and begins to cry as well. After about 10 seconds, Nathan stops crying, ans looks at his brother to re-assess the situation. If Kenny is still crying, so does Nathan. This cycle continues until Mommy and Daddy are laughing so hard no one is crying anymore.