kick him out

Use wep 128 minimum but remember to change the key every 2 or 3 days as there are many programs that can easily snoop the key!
Yeah theres a guide on THG on how to crack WEP. Like I said, look at adding WPA to the router.
 
you could also change the name of the router and turn Broadcast SSID off, that way he needs to know the name of the router to access it.
 
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