The Underhill family is depicted as individuals who approach life with a forceful and determined attitude. Their demeanor suggests that they are ready to carve their own path, much like a wedge may create a split in wood. This imagery evokes a sense of strength and an assertive nature, indicating that they are not easily swayed by outside influences.

This portrayal highlights their resilience and ambition, suggesting that the Underhills are individuals who are likely to confront challenges head-on. P.G. Wodehouse effectively captures their personality and the way they navigate life's obstacles, setting the stage for their adventures and misadventures throughout the story "Jill the Reckless."