ReThinking The neglected power of siblings with Susan Dominus
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Jun 24, 2025 
Susan Dominus, a staff writer at the New York Times and author of The Family Dynamic, dives into the powerful yet often overlooked influence of siblings on personal growth and success. She discusses how sibling relationships can shape our achievements more than parental actions. The conversation reveals insights on the interplay of nature and nurture, the effects of birth order, and the emotional dynamics that define sibling connections. Dominus highlights the unique roles siblings play in developing identities and providing crucial support throughout life.
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Siblings' Impact Underestimated
- People often overestimate the influence of parents and underestimate the impact siblings have on each other's success.
- Sibling relationships may play a critical and overlooked role in personal and professional achievements.
Genetics vs. Environment in Personality
- Twins separated at birth share about 50% of their personality traits despite 100% DNA similarity.
- Adopted siblings raised together are no more alike in personality than unrelated kids raised apart.
Parenting Nurture Matters
- More maternal affection between ages 5-10 predicts greater openness, conscientiousness, and agreeableness at 18.
- Even genetically identical twins show personality differences caused by parenting, showing nurturing can be underestimated.
