If you’ve ever watched a pair of siblings laughing over an inside joke, backing each other up at the dinner table, or navigating life with the seamless shorthand of best friends, you might assume it’s ...

Research consistently shows that relationships with siblings are special and important for well-being across the lifespan. In the United States, one in six children has a developmental or behavioral ...

"It's been part of our culture, at least in the US, to think that siblings fight. That there's going to be lots of times they don't get along. That's what they do," said Laurie Kramer, a professor of ...