The family of missing Belgian backpacker Theo Hayez hope an upcoming coronial inquest will investigate a number of scenarios around his disappearance which they say have not been fully explored by police.
Theo was 18 years old when he disappeared under mysterious circumstances during a night out in the popular tourist town of Byron Bay on May 31, 2019.
He was last seen leaving Cheeky Monkey's nightclub but mobile phone data revealed he travelled in the opposite direction to his hostel and toward the Cape Byron lighthouse.
A two-week coronial inquest will begin in Byron Bay on Monday with opening statements and a site visit to several key locations.
A large number of overseas witnesses are expected to give evidence during the inquest.
Theo's mother, father, brother and grandmother were granted exemptions to travel from Belgium to Australia for the inquest.
His godfather, Jean-Philippe Pector, and cousin, Lisa Hayez, have also travelled from interstate to be in Byron Bay with the rest of the family during the inquest.
In a statement, the family said they wanted to be sure Theo's disappearance was fully investigated with "no stone unturned".
They said they would like to see a re-examination and review of all the details of the case at a "higher level".
"Our concern remains that only one scenario seems to have been the focus of the police investigation, using all of the limited time and resources of the local police, instead of allocating police time and energy to other paths of investigation," the family said in a statement.
"We believe this new review of Theo's disappearance should be under the guidance of specialised missing person investigators and the NSW Police Missing Persons Registry, which was established with its new structure just a few months after Theo went missing."
The family said it was their strong belief that Theo was not alone when he left Cheeky Monkeys.
"We also hope a reward will be offered by the NSW government to encourage anyone with helpful information to come forward."
Happy ending 'not an option'
Theo's godfather Jean-Philippe Pector told the ABC he and the Hayez family had come to accept that there would be no happy ending to their ordeal.
"Realistically we know that the really happy ending is not an option.
"But it's really important to have some kind of release and to know really what happened.
"Not knowing is really the worst."
Community group offers family support
Community group Looking For Theo leader Renee Scott said members were doing all they could to support the Hayez family.
"We've organised all the cooking and accommodation, just practical things to reduce the cost of them being here," Ms Scott said.
Ms Scott said the group would be following the inquest closely.
"We'll be happy if we know that every avenue has been looked at," she said.
"Obviously a big part of it is making sure the community is safe, and that young people can come here and don't just disappear.
The inquest will begin on Monday in the Byron Bay courthouse before the state coroner Magistrate Teresa O'Sullivan.
