Cornishman Ryan Johnson is hoping DNA evidence will clear him of murdering his parents in Crete.
Ryan Johnson: Held in Crete
Terry and Jo Johnson, aged 53 and 54, from Newlyn, were found strangled last month in the home in Almyrida to which they moved last year.
Son Ryan, 32, was charged with their murder and bailed.
His passport has been confiscated while the prosecutor and an investigating judge determine if and when a trial will take place.
Mr Johnson, who has been joined by members of the family in Crete, said: "I am waiting for new DNA results from Athens.
"They have decided from the coroner's report that it would have taken two or three people to have done it."
Ryan's cousin Vaughan Eddy from Penzance said: "We are 100% sure he is innocent.
"Considering what he has gone through his spirits are remarkably high."
The bodies of Terry and Jo Johnson have been flown home, but the family says it cannot hold a proper funeral until the murder case has been cleared up.
Greek police are investigating another recent murder on the island, but the authorities say they are not linking this with the killing of Mr and Mrs Johnson.