How brothers and sisters stay close through the teenage years. - [The Age-gap Drift](/age-gap-drift/) - [Sharing Friends and Secrets](/friends-and-secrets/) - [The Borrowed-things War](/borrowed-things-war/) - [Sibling Loyalty at School](/loyalty-at-school/) - [The Comparison Trap](/comparison-trap/) - [Rivalry Turning into Friendship](/rivalry-to-friendship/)