On his desktop (which is also wireless), his internet is working fine. But on my laptop, when it asks me to connect, I can connect, but I do not get any internet access.
Any help? I called the linksys people twice, but they were of no help whatsoever.
This seems like the most likely case, and if he's done that, then he's probably knowledgeable enough to configure the settings for you.
If other people are going to use his network, it's probably simpler and more efficient to just turn on the DHCP server inside the router. Ask him if he can do this, as it will save a headache, and static IP routing doesn't really have any uses anyway (apart from in companies and institutions).
If your brother is smart about computers, talk to him, if he isn't, then just restart your PC, make sure the wireless switch is 'on', and make sure you're configuring to the right IP address.