Updated with a new introduction by the authors, this anniversary edition shows the sibling relationship as a distinctive emotional, passionate, painful, and solacing power that shapes who we are and who we become. The relationships among brothers and sisters are infinitely varied-a sibling can be one's worst enemy or closest companion. Though their love or hate, envy or compassion, and closeness or rivalry are formed in childhood, these bonds last throughout life, creating character and affecting behavior in numerous situations. Strangely, this profound attachment-second only to the...