Funny, that. I've got several machines around the house which are used by my daughters (~6 and 12 yo) and wife. The machines run Debian, apart from one on which

Funny, that. I've got several machines around the house which are used by my daughters (~6 and 12 yo) and wife. The machines run Debian, apart from one on which I installed Mint. I have several Android devices for the same purpose. Those Android devices range from a 2011 Ainol Novo 8 Advanced running Gingerbread to a Teclast X80 running Lollipop. I use Debian myself, on client and server hardware. We use Firefox, Seamonkey and Chromium (not Chrome). I never had a single piece of malware on any of these machines, ever. I do see lots of SSH login attempts to the servers (in vain, naturally) and quite a bit of exploit scanning for vulnerable services but the amount of successful intrusion attempts, whether on client or server, is zero. Maybe you should to try this solution for your children?