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Well, it's a waste of cash in my opinion. You could spend cash for a wireless router that can service multiple clients or you can spend cash on something that can service one item.
You currently do not have a broadband router. Right now you have a DSL modem and it sounds like your dad's computer is hooked directly to it. In this setup, there is no other way to get your Wii online than to use the WiFi thing that allows your Wii to connect to the internet through your Dad's computer. This would then mandate that your Dad's computer be on at all times in order for your Wii to connect to the internet. In my opinion, this is a messy option.
The cleaner option is to get a wireless router, plug it's WAN port into the DSL modems Ethernet port. Connect your Dad's computer to one of the Ethernet ports on the router and then configure your Wii to connect to the wireless on the wireless router. This, for the money, is a far more "normal" setup and much more useful long term (think, if you or your dad got any other kind of wireless device like a laptop, phone or PDA).
EDIT: Yes, you can "split a lan cable" using a hub or switch. A wireless router will act as a switch.
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