I understand the law is the law regarding carrying the necessary documentation, especially in this current climate in Turkey. But I would not be able to relax carting round 4 passports every time we nipped out, especially to the beach. So I hope that common sense is used regarding tourists, if you know what I mean. I may just take copies of the relevant pages, and chance my arm.
Certain British tabloids would have a field day if a couple of pensioners for example ended up in a bit of bother, no more negative publicity is needed at home.