The Science of Siblings is a new series exploring the ways our siblings can influence us, from our money and our mental health all the way down to our very molecules. We'll be sharing these stories ...

As any first-year psychology student can tell you, our personalities are determined by a complex combination of our genetics and our environment. Among the wide array of environmental influences on ...

What difference do siblings make? Apparently not a lot when it comes to social skills. Parents have been primed to be concerned that only children might have difficulties sharing and making friends ...