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Continue to ChatSibling rivalry lasts well into adulthood with a quarter of adults still arguing and competing with their brother or sister - despite now being grown-ups https://entertainthekids.com/sibling-rivalry-lasts-well-into-adulthood-with-a-quarter-of-adults-still-arguing-and-competing-with-their-brother-or-sister-despite-now-being-grown-ups/