 Twenty-nine year-old dental assistant Sandra Guay thinks her cousin Wendy Colville allows son Matt, 8 and daughter Taylor, 4, to get whatever they want. This weekend, with Crash Test Mommy Sandra in charge of Wendy s North Delta brood, things will be different and the kids will follow the rules!...says Sandra! Right from the bell, Drill Sergeant Sandra has a running battle trying to keep sugar fiend Matt away from the sweets in the kitchen, monitoring princess Taylor, and planning and executing a disco-themed backyard BBQ for the neighborhood kids - all while the world s worst dishwasher repairman simultaneously wreaks havoc in her kitchen. As Matt covertly gobbles candy from his secret bedroom cache, and Sandra continually sets off the smoke detector with her culinary prowess, Wendy enjoys a lifesaving hiatus from 24/7 motherhood. On mom s return home, Sandra admits to a newfound respect for how hard Wendy has to work as the real mom, but Wendy repays the compliment, congratulating her cousin for a doing a pretty decent job as this episode s Crash Test Mommy.