http://online.wsj.com/article/SB121978677837474177.html WORK & FAMILY By SUE SHELLENBARGER On the Virtues of Making Your Children Do the Dishes Quiz for the day: How much time each day, on average, does a 6- to 12-year-old child spend on household chores? If you guessed more than a half-hour, you’re wrong. Children are spending…