Seeking information about Charalambos and Panayiota Zantiotis (early 1900s)

Hi, my name is James Anderson, I was born in 1971.

I am seeking information about Charalambos Zantiotis and Panayiota Zantiotis, they would have been parents of grown up children during World War 2. They came from Potamos in Kythera. My grandmother is their daughter Kaliyopi (Poppy), she had two sisters, Grigoria and Koula, they had quite a few brothers too; I believe one of them was called Nikos and another Yiannis..

I have recently obtained a photograph of Charalambos and Panayiotis with the 3 daughters taken in 1925.

Please if you have any information I am keen to discover more.