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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Sibling birth order can affect your health and well-being in different ways. (Getty Images) (Westend61 via Getty Images) While ...

He wanted to find his birth family but didn't have the resources to track down family members. He didn't even know whether he had any birth siblings. The orphanage never disclosed information about ...