Are you the responsible eldest child, the peace‑keeping middle or the free‑spirited youngest? Many of us grow up with a sense that our place in the family says something about who we are—shaping everything from our confidence to our relationships. But according to Catherine Carr, author of Who’s the Favorite? The Loving, Messy Realities of Sibling Relationships , birth order can shape identity without ever fully defining it. “Sibling dynamics are almost endlessly complex,” Carr told Newsweek . “