Melvin likes to throw a tantrum when he does not get what he wants, but he learns that the classroom rule, "you get what you get and you don't throw a fit" applies at home as well.
Vivienne takes pride in being messy no matter what she is doing, but when the time comes to clean her room she is determined to work until all is neat and tidy.
When Janey gets tired of hearing that she is not big enough to do the fun things she wants to do, she decides that she is not big enough to do boring things too.