436. The psychology of sibling rivalry

436. The psychology of sibling rivalry

July 6, 2026 · 37 min

About this episode

This episode explores the impact of sibling rivalry from childhood into adulthood, examining its psychological and evolutionary aspects.

In many ways, sibling rivalry is an integral part of growing up in a multiple-child household – the arguments, the jealousy, the competition. But as we explore in this episode, those sibling dynamics often don’t stop in childhood, but actually following us into our 20s and adulthood, shaping how we see ourselves, relate to our families, and how we carry old roles.  We explore: •        Why a level of rivalry is developmentally expected •        The evolutionary perspective on resource competition •        The role of birth order and family roles •        How sibling rivalry can transpire in adulthood •        How to begin acknowledging and rewriting old roles Watch on Netflix: HERE Follow Jemma on Instagram: @ jemmasbeg Follow the podcast on Instagram: @ thatpsychologypodcast Subscribe on Substack: @ thepsychologyofyour20s For business: psychologyofyour20s@gmail.com   Our favourite sources:  https://prevention.psu.edu/news/the-psychology-behind-sibling-rivalry/ https://link.springer.com/article/10.1007/s10567-011-0104-5…

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