our resident four year-old concludes the following (with a little help from his older siblings):
daddy is a friendly introvert...
mommy is an unfriendly introvert (said slyly, with a giggle)...
boookie is an extra-extrovert...
sissy is just a plain ole' introvert...
"i'm a friendly introvert, like daddy"...
and the teething four month-old is "an unpleasant extrovert!"
