Greg’s mother is optimistic and maternal, always encouraging family togetherness and building memories, though her insistence sometimes frustrates Greg.

Greg’s father is portrayed as resourceful and agreeable, often going along with his wife’s plans and handling traditional family tasks.

Greg’s three-year-old brother is a dynamic and resourceful character, capable of surprising actions that challenge Greg’s perspective.

Greg’s older brother often antagonizes him but also serves as a familiar presence, with their sibling rivalry characterized by pranks and minor annoyances.