As a responsible parent, you should not be relying on filtering to educate your children. Filters have more holes than Swiss cheese, often block entirely legiti

As a responsible parent, you should not be relying on filtering to educate your children. Filters have more holes than Swiss cheese, often block entirely legitimate educational resources, make your children know that you don't trust them to be responsible, and learning about proxies and VPNs is trivial for them (just try googling "proxy servers unblock websites"). If you don't trust your children to use the internet responsibly, don't let them use it. Or let them use it but only under your supervision. If you let them go wild but put up filters, they will find a way around, one way or another, and at that point the princess is in another castle.