Sibling rivalry occupies a surprisingly generative position in the depth-psychology corpus, functioning simultaneously as a clinical datum, a developmental milestone, and a mythologically resonant complex. Freud establishes the foundational terms: the arrival of a younger sibling precipitates hostility, wishes for removal, and even physical attack, phenomena he traces with unflinching directness through parental observation and clinical inference. For Freud, sibling rivalry is not incidental but constitutive — it feeds the family complex, amplifies Oedipal dynamics, and introduces the child to the grammar of rivalrous desire. Otto Rank extends this framework toward the intrauterine register, proposing a 'brother or sister trauma' rooted in the displaced child's unconscious identification with the returning newcomer in the womb. Melanie Klein situates rivalry within her account of envy and jealousy, arguing that when primary envy is not excessive, sibling-directed jealousy actually serves a maturational function, distributing and thereby metabolising destructive impulses. Murray Stein offers a Jungian typological reading, showing how differences in psychological type between children set the stage for favouritism and consequent rivalry. Irvin Yalom observes the phenomenon reactivated in the group therapy situation, where it emerges as a transference pressure late in group life. Howard Sasportas, working astrologically, maps early sibling dynamics onto the third house and notes their tendency to repeat across later relational configurations. The corpus thus reveals sibling rivalry as a nodal concept at the intersection of drive theory, object relations, typology, and group dynamics.
every opportunity is seized to disparage the new-comer; attempts are even made to injure it and actual attacks upon it are by no means unheard-of.
Freud documents the primary phenomenology of sibling rivalry — hostility, disparagement, and physical aggression toward the newly arrived sibling — arguing this hostile attitude is typically the earlier and more fundamental one.
, Introductory Lectures on Psycho-Analysis, 1917thesis
When other children appear, the Oedipus complex expands and becomes a family complex. Reinforced anew by the injury resulting to the egoistic interests, it actuates a feeling of aversion towards these new arrivals and an unhesitating wish to get r
Freud argues that sibling rivalry is structurally integrated into the Oedipus complex, transforming it into a broader family complex driven by wounded egoistic interest.
, Introductory Lectures on Psycho-Analysis, 1917thesis
the child envies the dead the happiness of return to the mother and so links his real jealousy to the new brother or sister, generally at the period of pregnancy, that is, at the time of the abode in the mother.
Rank relocates sibling rivalry to the intrauterine level, proposing a 'brother or sister trauma' in which the existing child's jealousy is activated by the newcomer's symbolic re-entry into the mother.
, The Trauma of Birth, 1924thesis
Hostile feelings towards brothers and sisters must be far mo in childhood than the unseeing eye of the adult observer can
Freud insists that hostile sibling feelings are far more prevalent than adult observers recognise, grounding this claim in direct observation of his nephew's response to a newborn rival.
, The Interpretation of Dreams, 1900thesis
If envy is not excessive, jealousy in the Oedipus situation becomes a means of working it through. When jealousy is experienced, hostile feelings are directed not so much against the primal object but rather against the rivals — father or siblings — which brings in an element of distribution.
Klein argues that sibling rivalry, as a form of jealousy, can serve a developmental function by displacing and thereby distributing destructive envy away from the primal maternal object.
, Envy and Gratitude and Other Works 1946-1963, 1957thesis
The child with the 'correct' typological profile will be preferred and become the favorite. This sets the stage for sibling rivalry and envy.
Stein proposes a Jungian typological aetiology of sibling rivalry, wherein parental preference for typologically congruent children generates favouritism and consequent rivalry among siblings.
, Jung's Map of the Soul: An Introduction, 1998thesis
Anna threw a rapid glance at her rather wan-looking mother and then displayed something like a mixture of embarrassment and suspicion, as if thinking, 'What's going to happen now?'
Jung presents a detailed clinical observation of a child's ambivalent, rivalrous response to a newborn sibling, illustrating the early onset and complexity of the sibling dynamic.
, The Development of Personality, 1954supporting
Was there the feeling that a younger sibling usurped their central position in the family? Did an older sibling take out his or her frustration at being dethroned onto them? How competitive were siblings?
Sasportas maps sibling rivalry onto the astrological third house, presenting structured clinical questions that reveal how early competitive sibling dynamics persist and repeat in later relational life.
, The Twelve Houses: An Introduction to the Houses in Astrological Interpretation, 1985supporting
Still later in the course of the group, anger may stem from other sources: projective tendencies, sibling rivalry, transference, or the premature termination of some members.
Yalom identifies sibling rivalry as a distinct source of hostility that emerges in later stages of group psychotherapy, framing it as a transference-adjacent phenomenon reactivated in the group context.
, The Theory and Practice of Group Psychotherapy, Fifth Edition, 2008supporting
Oedipal conflicts, feelings of sibling rivalry); Carl Rogers, a farm boy and seminarian, was no doubt an unconditionally positive, warm person
Sedgwick notes sibling rivalry alongside Oedipal conflicts as formative personal complexes that shape the theoretical orientations of major personality theorists, illustrating the concept's biographical reach.
, An Introduction to Jungian Psychotherapy: The Therapeutic Relationship, 2001supporting
sibling rivalry 19
A bare index reference confirming that sibling rivalry is treated as a named concept within the Jungian psychotherapy framework of the text.
, An Introduction to Jungian Psychotherapy: The Therapeutic Relationship, 2001aside