This is very simple. The kids can help to dust the sardines but do not let them approach the frying pan as the oil often splatters.
You only need:
4-5- sardines per person. Small ones are best. You can also do this with anchovies, though they are more expensive.
Put a generous amount of olive oil into a frying pan. Heat it until the oil is about to produce smoke. Add the salt on the sardines and dust them in flour. Put them on the olive oil, reduce the heat to medium and fry the sardines on both sides ( this only takes a couple of minutes on one side and a minute on the other one). Serve immediately.