Vlantis - the African family branch

My grandfather, Emmanuel Vlantis, emigrated from Kythera to 'Rhodesia' in the early 1900's and married Emerenstia. He had five childen. Menalos, Calliope, Cleo, Hester and Christian. I am Alexander Vlantis, the eldest son of Christian Vlantis. All seven of these members had the surname Vlantis. I would be very grateful for any information about this extended family