Offer to help clear before anyone asks.
Owning a mistake, cheering someone on or offering the last piece are small moments at the table that say a lot. A playful mission gives children a reason to try them without a lecture.
Kalmdix announces the mission as a playful quest at the start of the meal, then lets the children talk about whatever they like. It works on one habit over five meals; on the fifth, the mission is a secret. Kalmdix never says who did or didn't do it: the results appear after the meal.