enixcell :
I actually don't know how I have two channels. Inssider tells me 6+11. his nook is the latest model so I'm assuming it is b/g/n
You can't really have two channels using 6 and 11 with consumer wireless routers unless you have a separate AP. One of those networks is not yours. Your should be the stronger since you are only 6 feet away -- take a look at the SSID.
One other question, if you are connected by an Ethernet cable, do you still get booted from the network by his logging in?
Yes, the latest Nook models are b/g/n.
I would also recommend that you review your DHCP settings and if available on your router, instead of static addresses use dynamic reserved addresses. Then set all devices to automatically obtain an address from the gateway. Also just for fun, make sure that you are using WPA2 security and have WPS disabled.