The iPad Guy has had several parents ask if such-and-such a site can blocked at home for the iPads.
That is indeed doable, but only on the network at the house. It is not something the school can do for you.
You need a wireless router that includes a feature that is usually called “parental controls” or similar. [Here’s an Amazon Link]. Usually the network cable that comes from the wall plugs into a cable modem [or other box provided by your service provider], and then the wireless router plugs into the network jack on that box.
You’ll have some configuring to do – the routers all work somewhat differently. I suggest doing a Web Search for your router model plus “how setup parental controls”. [LIKE THIS, for example].
Some families would find it useful – especially if there is a home business involved – to have TWO wireless networks available – one for family, one for business, for example. Some wireless routers have that capability – some others can have a “guest” network that you can password protect that could be used for that purpose as well.
A last word about costs:
These kind of features are NOT found on the less expensive routers. You will probably pay over $100 for that feature set.
…and please use a good quality surge protector on the router – NOT a $10 one. You are protecting a critical part of your network, so it is worth spending more to make sure the thing KEEPS working!