The stereotype for only children is that they are selfish, or more self-centered than those with siblings. This stereotype is sometimes used as an argument for having more than one child, but researchers from Germany find there’s no evidence for the claim that only children are more narcissistic than children with sibling. Michael Dufner (University of Leipzig), Mitja D. Back (University of Münster), Franz F. Oehme (University of Leipzig), Stefan C.
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