You actually have a couple different options.
Did a little checking and Win 7 does have ICS = Internet Connection Sharing.
Using ICS requires a cat5 or above cable and that your PC be turned on for this to work. As well as some configuring of your, the Host, PC. MS ICS information.
Or a simple network switch
and cat5 or above cable would work as well.
This does not need your PC to be turned on in order for your Son to have internet access.
While this method dose involve a minimal $$ investment for the switch and cable it would be my preference for the method used.
Edited by ThunderZ, 25 April 2011 - 09:52 AM.