Family Friendly DNS - easy as Pi

So my kids are getting older, and are now quite happy searching the web and amusing themselves in Cyberspace. I am both delighted and terrified in equal measure!

So, I've got YouTube in Restricted mode, and have the usual Apple related restrictions in place, but I also discovered that Cisco operate a free, family safe DNS. You can read up on it here, but basically you put these settings in your router or computer, and you're done.

So, I want to have these DNS settings applied to the kids iPads and the Apple TV, but nothing else, as that's what the kids use.

As it happens I'm using a Raspberry Pi already for my internal IP DHCP and DNS, to get round some rather lame restrictions on the Virgin router. So, here are some cute settings for dnsmasq, which is easy enough to install on a Raspberry Pi (instructions here):

dhcp-host=b8:78:2e:32:ae:1e,set:specialhosts,192.168.0.18 # Apple TVdhcp-option=tag:specialists,option:dns-server,208.67.222.123,208.67.220.123

The first line is a fairly standard static IP allocation, to lock my Apple TV onto a specific IP. Note the set:specialhosts in the middle though. That means you can then use the second line to provide DNS servers specific to any line with that set:specialhosts.

So I have a dhcp-host line for each of the things I want to use a different DNS, and then define that DNS using the second line.