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It’s a little harder to monitor which laptop is visiting which site than it is to see all traffic over the router. If you don’t really need to break it down by each device, all you really need to do is set up a free OpenDNS account and change your router settings to add the OpenDNS server. I would suggest trying this first, because it is so simple.
If you really want to monitor each device, it will require more effort. There is a solid guide on How-to Geek that walks you through it.