Well, first off, not everybody KNOWS how to use a computer but that wouldn't make them bad teachers.
Yes, we are of the technological age and I for one embrace it as much as possible; as an agoraphobic the internet is the only way I get to meet and talk to people...
BUT - There are dangers to the internet and at the end of the day it's the Principals (we call them Headmasters or Mistresses!) responsibility to make sure that all computers are checked for these things - not a Supply Teachers. As far as I'm concerned the Principal should be put in jail not the poor woman who is.
As for that Italian family... Get a grip would you? Your relative's probably an incompetent dolt!