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I'm slightly confused...

You could turn the Wifi off on that Mac. I don't follow why that would kick your other Mac off the network, unless it's connected via network connection sharing, in which case I don't see how you can knock a computer off the network but still use it to share a connection.

Alternatively, you can turn MAC filtering on, if it isn't already, and just delete that computer from the access list.
 
I want to temporarily turn off Wi-Fi access to my brothers MacBook. He is in the teenage phase of his life where he doesn't listen to anyone and spends his entire day online. He's getting horrible grades in school cuz he doesn't study/do his homework (he's incredibly smart, but doesn't apply himself). If my mother tells him to do a few chores around the house, he refuses to do them. Therefore, I want to be able to have the ability to turn off/on the Wi-Fi on his MacBook.

How do I turn on MAC filtering?
 
How do I turn on MAC filtering?

AirPort pane, Access tab. You can even set up timed access so that the connection is available for specified hours (otherwise choose Timed Access anyway, and set it to every day, all day).
 
Open up the airport utility and select your AEBS first.

That's the way to go, now that you've described the concern in more detail.

Also, "phase." Faze is a verb that means something different. ;)
 
Open up the airport utility and select your AEBS first.

That's the way to go, now that you've described the concern in more detail.

Also, "phase." Faze is a verb that means something different. ;)

That's the word I was looking for! Thanks! lol.
 
Okay, I found this pane
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I want my MacBook to have unlimited access, but limit the time/have the ability to lock out my bros Mac at any time. Now what? :confused:
 
Hit the '+' icon, this will give you a window for you to enter the MAC address of your brother's machine and what access to give it.
 
Last question, I promise. Where do I find the MAC address.

Never mind! I found it. Thanks for all your help, guys. Much appreciated. :)
 
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