Studies found that people with more siblings mostly have high levels of the cooperation trait. They also saw that there is a small effect on cooperative personality traits with the middle and the youngest children, who are superior to firstborns. 



Study: Middle children tend to be more honest than their other siblings

Recent studies found that middle children are more honest, humble, and enjoyable than their adult siblings in a family. It also said that middle children are one step ahead of their siblings in things like agreeableness, cooperation, and humility.

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Study: Middle children tend to be more honest than their other siblings

Study: Middle children tend to be more honest than their other siblings