Bavea Family information

Hi There,

I am looking for information on my great grandfather John Nicholas Caroonarus Bavea (Jack Bavea) and my great great grandparents. I have been able to source quite a bit of information about Jack and his brothers Jim and Peter and their successes in Australia with catering but I have been unable to locate any information on their parents. I was hoping someone may be able to point me in the right direction. From my understating my great grandfather hails from Potomos Kythera Greece so I am hoping my Great Great grandparents are also from there/ lived there. 
 

I hope someone can help me :) 

Christie