Hello

I wonder if anyone recognises people in this group photo taken at a well-known lake in modern day Slovakia? My father and sister (Ropschitz, Lvov) are recognisable to me but as it's such a great photo and so many faces are clear, I thought I would share it. 

I have another photo taken in a cafe in the same region I believe which I will also attach for the same reason.
Kind regards, Yolanda, Somerset, England