What was the trick played on Mrs mebane in cheaper by the dozen?

In "Cheaper by the Dozen," Mrs. Mebane, the neighbor, is tricked by the Baker children during a game of pranks. They create a ruse to make her believe that their family is planning to have a large, messy party, which causes her to panic and take action. This prank highlights the children's cleverness and adds a humorous element to the story, showcasing their playful spirit. Ultimately, it serves to illustrate the lighthearted dynamics between the characters in the film.