It is from society that the child learns that something is horribly wrong and that he should not adopt the offending parent as a role model. The formation of the Superego is stunted and it remains infantile, ideal, sadistic, perfectionist, demanding and punishing. The Ego, on the other hand, is likely to be replaced by a False Ego version, whose job it is to suffer the consequences of the socially hideous act. One of the main businesses of the family is to teach to its members self control, self regulation and healthy adaptation. Family members share space and resources, for instance.
Siblings share the mother's emotions and attention.
Similarly, the family educates its young members to master their drives and to postpone the gratification and satisfaction, which attaches to acting upon them. The incest taboo teaches children how to control their erotic drive by abstaining from ingratiating themselves with members of the opposite sex within the same family. Additionally, it probably interferes with the defensive aspects of the family's existence. It is through the family that aggression is legitimately channelled, expressed and externalized. By imposing discipline and hierarchy on its members, the family is transformed into a cohesive and efficient war machine.