One summer evening during a violent thunderstorm a mother was tucking her small boy into bed.

She was about to turn off the light when he asked with a tremor in his voice, "Mommy, will you sleep with me tonight?"

The mother smiled and gave him a reassuring hug. "I can't dear," she said. "I have to sleep with Daddy."

A long silence was broken at last by his shaking little voice, "The big sissy."