I killed my first black widow this morning. She was hanging around in the corner of the garage next to the lawnmower.
It's cool that you're teaching the kids what to look for, it should take some of the fear/mystery out of the little bastards (the spiders, not the kids). I wish someone had done that for me, because I lived with an insane fear of spiders until I was 18. When I turned 18, i went to college and my roommate was determined to get me over that fear, so we bought a tarantula. I'm not afeared anymore