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How do siblings shape your personality?

By Deborah Kotz
Globe Staff / October 31, 2011

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Research has long established that parents play an integral role in shaping our personalities, but scientists are now finding that our siblings may contribute just as much, or perhaps even more. In an intriguing new book called The Sibling Effect, science writer Jeffrey Kluger argues that brothers and sisters leave a firm imprint, helping to determine whether we’ll become free-spirited risk takers or careful studious types; whether we’ll be shy or the family entertainer; and whether we’ll be inclined to smoke, use alcohol, or take illegal drugs.

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