He can use his xbox through the wireless router, but you need to buy the xbox adapter for $100. For video game consoles, I suggest staying away from wireless. Wireless can product lag and signal drop out due to interference from other wireless devices close by. The interference could even be from your neighbors. My suggestion is take a look at these links:
In other words, you can use powerline to connect your xbox to the router using the electrical wires in your house rather than going wireless. It works great.
http://syndicate.sellpoint.net/Netgear__Inc_/38538/6637-3X1P9C-33-player-T1_MP/MPPlayer/__MPPlayer.html?r=1217565992965
http://www.cnet.com/4520-7390_1-6274537-3.html
http://www.youtube.com/watch?v=dqLblMpcl7c
http://www.youtube.com/watch?v=vHmeLQ8zDKs&feature=related
http://www.youtube.com/watch?v=NoBYr3EzkPw
http://www.youtube.com/watch?v=5HDSVo2ouH8
http://www.youtube.com/watch?v=lH-omrPFb5s
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Description=powerline
http://www.newegg.com/Product/Product.aspx?Item=N82E16833181077
I recommend this product the most below.
http://www.newegg.com/Product/Product.aspx?Item=N82E16833149002