Not necessarily. All we really know about Keen's sister is that short line in You've Got to Eat Your Vegetables.VikingBoyBilly wrote:But Keen's sister is supposed to be 4-5 years old so... [insert end of sentence here]
First of all, this is just Bobby Prince's interpretation, which doesn't necessarily make it canon.
Second, you can't really tell from that line alone how old she is. Sure, one could assume that, from the higher pitch and the taunting ("nyeh nyeh nyeh" or however you would spell it), that she is a little kid. But then again, the higher pitch could just be to differentiate it from the other "characters" in the song (plus, some girls have high pitched voices, even when they're older). And the taunting could just be typical brother/sister immature conflict, which is something that kinda exists for siblings of all ages.
So... there's my rebuttal on this completely insignificant issue.
Also:
Also I agree with what Spleen is about to say!