[RegBarclay]

I bought a Gryphon router to deal with this. It conditionally blocks VPN access by device/user. It's generally been really good, but I've had to back down some of the settings occasionally because school assignments/sites were blocked.

[josephcsible]

Hopefully that will get your kids interested in things like obfsproxy, and maybe they'll even end up being able to contribute new methods to bypass China's Great Firewall when they grow up.