Modern research echoes Adler’s theses. In simple terms, siblings differentiate themselves to reduce direct competition. If ...

Madelyn Cline recently shared that she fully supports the 'Outer Banks' sibling theory and hopes it can come true in the future. The Outer Banks sibling theory is based around the fact that both JJ’s ...

In a new sibling trend, sisters on TikTok are identifying themselves as either the “pink sister” or the “purple sister” — but what exactly is the “pink vs. purple sister” theory, and where did it come ...

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 ...

Forbes contributors publish independent expert analyses and insights. Mark Travers writes about the world of psychology. Sibling rivalry is a common occurrence within families, characterized by ...

Back in December, I was on my way to meet ‘Ryan’ for drinks in Tribeca. We matched on Hinge two days prior, and I appreciated how quick he was to set and plan a date. When I walked into this dimly lit ...

Earlier this year, on New Year's Day, Emma Trenchard was on holiday in Cape Town, South Africa. She was visiting her older brother and his family, and they were out to lunch at a cafe. "We were just ...