Searching for Tsaousis/Tsousis

My name is John Reggars and my paternal grandfather Angelo Tsaousis/Tsousis was born in Viarathika. He emmigrated to Australia and settled in Queensland in the early 1920's and established a cafe in Redclife. He had 4 children Peter. Minas (my father) Leo and Maria. Apparently his name was changed when he arrived in Australia to Reggars. According to my fatherI believe he had relatives in Dubbo and western Queensland. I visited his village in 1985 and according to one resident whom I met there and who had worked with my Grandfather in Australia(I think his name was Nick Athousis) our true family name is Relios? I would be grateful if anyone has any information regarding the family history.