In the car on the way to swimming lessons:
Nathan, "Mommy, is Sammy grown up now?" Note: Sammy is the boys' 2 year old cousin. He moved to TN about 6 months ago.
Isaac, "Well, he can say everything now so he is grown up right?"
Mommy, "He can say lots of words but I don't think he is all grown up yet."
Nathan, thoughtfully, "Can he say soon? You have to be grown up to say the word soon."
Isaac, somewhat disdainfully and with a slight eye roll, "I know he can say soon."
Nathan, "Well can he say Sauron?"
Isaac, "Oh I bet he can't say Sauron yet. He doesn't even know who Sauron is. I guess that means he's not grown up yet."
There you have it. According to the S brothers, grown up status hinges on one's ability to recognize and pronounce the names of fictional evil wizards.
So Mary, IS Sammy grown up yet?