Time to tell your daughter's bf to stop using your Internet.
Yes, all routers keep track of usage. Open a web browser, i.e. Internet Explorer, and enter the following IP address '192.168.2.1' (no quotes) Login. Default is no username (leave blank) and the password is admin (I think) Once inside the router there is a page that lists all the statistics. It may take a while to figure out what is what but everything you are asking about is listed.
The best way to prevent the daughter's bf from using the Internet is to put encryption on the wireless. If you don't have that setup, repost and I'll explain how you do it.
Best,
-- Andy