No it is not a wireless connection it's a wired LAN connection. My brother isn't very techno savvy but I would have to say that my cousin is and so that is who I am more worried about.
How easy it is to set up a sniffer and how easy is it to do the filter thing? Also is there anything I can do (other than getting a connection that I don't share) to stop them from doing this? And the audio and video conversations can't be recorded can they? Thanks for your help!