As an expert in literature and specifically in the "Divergent" series by Veronica Roth, I can provide a detailed answer to your question.
In the "Divergent" series,
Tris and
Caleb are not twins. They are siblings, but they have a two-year age gap between them. Tris is the younger sister, and Caleb is the older brother. Their relationship is an important aspect of the story, as they both navigate the complex world of their dystopian society, where people are divided into factions based on their virtues.
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