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Definitely! It depends on how advanced with technology you are though. If you know what 192.168.0.1 (or 192.168.1.1) is, then you know that you can access settings with your router. Inside there, you can find the device and add the device to the MAC Address blocking list. This will block all access to the internet. They can connect, but it won't let them use it at all. Whether that is available or not depends on your router, but anything fairly new should do the job.
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