Do you want something with kids' entertainment laid on or not? Do you want to be near a sandy beach? Do you like busy or quiet? Will you be wanting to go out and about to see things, or are you likely to stay on a beach/by a pool? Do you like a good choice of places to eat in an evening and want that within strolling distance?

Sorry for all the questions, but it'd help to narrow down a little what you may be looking for

If you want be English on holiday yes Sidari, but if you want to witness proper Greek you will not find it in Sidari, for beaches would say Skiathos, general family needs Corfu has some lovely areas Kassioppi, Achraviy spelt wrong, Corfu town is beautiful, My favorite Island is Kefalonia but with children of the ages of yours maybe not although it a lovely place prehaps a little upmarket Island to most not wanting to sound pompus, do not get lager louts as they are described As we have travelled a lot of Greek Island some where many years ago and could have changed, but Kefalonia has not since we have been going since 1989
pojo