ABSTRACT
Understanding the twin relationship and how this deep attachment grows and changes throughout the lifespan is a lived but an untold story. This chapter explains how different twinship is from children who are born alone is complicated and a labor-intensive problem. Early memories of the twin relationship reveal the pattern of twinship that is the foundation of personality development. There are of course different types of attachments that twins who are too interconnected share. Twins are closer than brothers and sisters because they share an identity based on early life experiences and the reaction of others. Psychoanalytic theorists suggest that twins have issues with intertwined ego boundaries. "Interdependent-identity" twins use one another for companionship, support, and reassurance. A fear of expansiveness is common for interdependent-identity twins, who prefer to be copies of one another by sharing values and decision-making. Both identical and fraternal twins can manifest a split identity.
