Hmm...

I found this paragraph from this article, on birth order, really interesting.

The next born, or any youngest, can benefit from watching family dynamics play out before his or her eyes. "Observing is what youngest children do well," says Agati. "They are some of the best con artists you've ever met in your life, because they understand the dynamics of people. They are born into this family full of brothers and sisters, moms and dads, cats and dogs—hey, they'd better learn how to size up people real quick or they're not going to survive."