Of the worst design, it would seem. ;)
Sometimes, the TG drives the story, and sometimes, the story drives the TG, as they say. This is the latter, but I grew up around enough siblings to see this being more realistic than you might think--fortunately, as an only child, I didn't have to endure any of that myself. Any of you ladies have "that" brother or sister who would do just about anything to beat you to the punch? =)