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Ok, but his issue only started when his brother got a new laptop and only doesn't work when said laptop isn't right next to his. So unless his laptop is in love with his brothers and refuses to work unless it's next to him; it sounds more like a router issue.
You could say that maybe the packets being sent by his brothers is fucking up his, but then, why would it work when they are next to each other, and thus the signal coming from his brothers would be strongest?