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The study of the role of siblings in early life led to an exploration of rivalry, envy, and jealousy, their differences being based on their genetic source and the dynamic aspect of each. This paper focuses on normal development and not on the clinical conditions in which rivalry, envy, and jealousy arise as part of a trauma. One of the positive contributions to psychic development are conflicts deriving from emotions of rivalry, envy, and jealousy. They are expression of interactions between the structural components and lead, within the normal range, to an increased alertness that facilitates comparisons and thereby promotes the differentiation of the object and the self. Such contributions are neglected by psychoanalytic theories of early development that are based on the dyadic mother-child relationship and exclude the role of the father, other caretakers, and siblings. A reduction of the conditions of normality to the dyadic relationship of mother-child fails to recognize the developmental pull that pre-oedipal conflicts make possible. On the other hand, structural approach to the Oedipal situation and later phases does not give sufficient weight to the integrative ego functions. An examination of rivalry, envy, and jealousy confirms the role of multiple objects in early life and its influence in consolidating the primary object representation on successive levels throughout development.