The longest human connection that most of us will experience won’t be with a spouse or a childhood pal – it will be the one we share with our siblings. With any luck, we will know our brothers and ...

Most friendships begin in the school years or in adulthood, and romantic relationships often appear later and sometimes end. But sibling relationships begin at birth and span every stage of life.

We all bring our early ways of interacting with our families to our adult close relationships. Much of the existing research on how early family relationships affect how adult couples interact focuses ...