Yes and No

Yesterday, we bought a small box of Goldfish crackers. Thomas wanted some as a snack during the afternoon and ate about half of it. Later, Jonathan wanted to try some so Thomas got some out for him. He'd eaten a lot of them earlier and we were going to have dinner soon so I told Thomas he couldn't have any more. Just give his little brother one at a time. That worked for about 2 minutes and then Thomas said, "Can I have this one since Jonathan's not eating it?" I said, "No." "Can I eat this one that fell on the floor? It's too dirty for Jonathan to eat." "Well, if it's too dirty for him to eat, it's too dirty for you to eat." "Can I just have ONE?" "No, no, no, no, no!" By this point we're both laughing. I looked at Jonathan and said, "Jonathan, I don't think your brother understands what N-O means." Thomas got this little twinkle in his eye and said, "Y-E-S!"