```family``` is, well, the family of the address -- something like "IPv4", "IPv6", or "UNIX". For now, we should only see IPv4, but once IPv6 finally takes off, WE'RE READY!

I've explained this in the comment. Mainly, it is included because that's what node's call to ```address()``` returns and I didn't see a reason to mess with the object. Let me know if you think it should be removed.