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At a time when teamwork and networking (or even open space working) are widely advocated, it is worth recalling the importance of sibling relationships, the breeding ground for each individual's subsequent transversal bonds. Many aspects—whether conscious or otherwise—buried in individual and family histories, sometimes dating back a very long time, intervene in and define sibling bonds. As every sibling relationship is singular, each evolves according to life events, whether they are intrinsic to the members of the family or not. This contribution develops some aspects of sibling relationships in which one brother or sister is gifted, highlighting certain parameters of sibling dynamics. It is common to observe bitter sibling rivalries whose origin lies in the “giftedness” of one child and in which the parental generation is usually involved.