[exelius]

This makes total sense -- you do what you know. As a child growing up, you emulate your parents in a lot of ways. If your parents are factory workers, they probably didn't push you towards college so you will end up in a similar job. Likewise, if your parents are doctors, you not only have a path to medical school laid out before you, you likely have connections that would give you a better than average chance of acceptance.

Good to see this proven out with data; but I'd consider this a pretty intuitive conclusion.