The father of two children killed near Budapest by a car driven by an Irishman said he hopes the driver will return to Hungary to give himself up.
Bence Zoltai said this would be the best possible outcome for all parties.
He told RTÉ News he understands that Ciarán Tobin would have to serve only days of his sentence in Hungary before being allowed to return to Ireland to serve the balance.
Tobin was driving a car which struck and killed Marci and Petra Zoltai, aged two and four-years-old, in April 2000.
He was convicted of negligent driving and sentenced to three years in prison but had left the country to return to Ireland before he was sentenced.
Two attempts to extradite him from Ireland to Hungary have failed.
Last week, Hungarian Deputy Prime Minister Tibor Navracsics, in reply to a letter sent by Minister for Justice Alan Shatter, gave his personal guarantee that if Tobin returned to Hungary to give himself up, he would be allowed back to Ireland in the shortest possible time to serve his sentence.