Had 2 of each myself - and I'll agree with Kelly about the moody boys - read once that teenage boys' frontal lobes practically shut down during adolesence - explains the neanderthal grunting I suppose! Can't say much about the girls - Claire is Claire (a one off, I think), and Bonnie was always sweet tempered.
Another thing about boys - since they both left home we go through so much less toilet tissue
!!!
Hats off to you Kerry for photographing a bunch of kids of any gender though - tricky job always!