
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 over the next several weeks.


Stepsiblings get a distorted rap in popular culture. On the one hand, you’ve got Cinderella and her evil stepsisters. On the other, there’s The Brady Bunch, where six stepsiblings get along almost ridiculously well.
“The Brady Bunch did not help us when it comes to what to do in stepfamilies. It really didn’t,” says Caroline Sanner, an…