Just do not let them infect the entire network
At the moment, my set up is just two separate PCs connected to the internet through a router; I haven't set things up as a network yet. And maybe I won't 'til the kids learn some net-sense
Trouble is, they will insist on visiting these gaming sites and I am sure most of this crap comes from there
As you say, having people like Liam around is a great help
All the best
Aiglon