Where and who are my relatives? Additional information....

Hi everybody. My Grandmother, Marietta Logothetis, only child of Minas and Katerina Logothetis of Logothetianica, Kythera. I have no information about Katerina, except to say that her father was a ship's captain and her mother was an Italian from Naples. I think that she too, came from Kythera. Any information is gratefully received. I live in England. Regards, Laura

PS Minas Logothetis was born around 1846 and, certainly,as an adult, had a factory in Pireaus that processed waste material from the dock areas (for purposes unknown) where he lived with his family. We are led to believe that the family built a church in Logothetianica. Anyone know of and about him, his life and his relatives?