teckman7 :
Do you mean it will just be the same as it is now? Like I'm already sharing the internet with him?
Without detailed info on your particular setup, it is impossible to say.
But for 'internet' going to the outside world...it already all goes through the same pipe from the modem.
How you connect to the modem may differ, but a 20mbps (or whatever) pipe from your ISP does not care about the connection between you and the router.