The Rex family refers to a family consisting of two Tyrannosaurus rex that live in Elmore's junkyard. The first appearance of a family member was Tina in "The Third." Her father later made his first appearance in "The Quest."
- Tina: The fourteen-year-old daughter of Mr. Rex. She attends Elmore Junior High in Miss Simian's class.
- Mr. Rex: The father of Tina. He lives with her in a large house in the junkyard, and has a scarred eye.
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