How do I block another computer in my house w/ LAN without having to pull out the cord?

Bingzhong

New member
So I want to basically disable the internet on my other computer in the home because my sibling is using the internet for crap and is taking up my bandwidth.
I want to disable the internet connection to that computer without having it to connect back. How do I do this?
The computer she is using is connected via LAN, and I don't want to take it out. I want to just block the computer from my network.
 
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