Something You Should Know Why Siblings Turn Out So Different & Why Talking to Strangers Helps
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Apr 6, 2026 Jillian Sandstrom, a psychology researcher on social connection and author of Once Upon a Stranger, and Catherine Carr, author and podcast host who studies sibling relationships, discuss why brothers and sisters raised together can turn out so different. They explore birth order, age gaps, reconnections, and why brief chats with strangers boost mood, belonging, and unexpected opportunities.
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Firstborn Advantage Is Role Not Destiny
- Birth order isn't deterministic but firstborns often score slightly higher on some tests due to early parental resources and expectations.
- Studies show when oldest dies, next child often achieves similar IQ and career outcomes, implying role-driven effects.
Gender Timing Drives Sibling Closeness
- Gender shapes sibling closeness: sister-sister ties tend to be closest, brother-brother more conflictual, influenced by synchronized development and gendered caregiving.
- University of Utah research found puberty timing and shared developmental stages predict closeness; women often provide elder care, increasing intimacy.
Only Child Stereotypes Come From Bad History
- Only child stigma is historical myth; research shows only children match peers by adolescence and often value friendships more.
- Carr traces stereotypes to Granville Hall's biased 19th-century cases and Depression-era stigma, but modern studies find parity by age 12.
