Shayne Goodchild, the father of Kate Goodchild and Luke Dorsett, who died in the Dreamworld ride disaster is trying to fathom his sudden loss.
At an emotional media conference in Canberra, he read a statement with his son-in-law David Turner by his side on behalf of the Goodchild, Dorsett and Turner family.
"I have lost my only daughter Kate, my youngest son Luke, we've also lost Roozi - a man who, Luke's loved, beloved partner, I considered to be another son." said Mr Goodchild.
Mr Turner was minding his youngest child Evie when his wife Kate Goodchild and eldest daughter Ebony were on the ride.
Mr Goodchild said the tragedy is all the more difficult having to explain to the girls what happened to their mother.
"We also all have to help two little girls to come to the fact that their mum is never coming home."
The family from Canberra is now make preparations for the funerals.
"To say this is just not fair, doesn't begin to express our despair."
Mr Goodchild thanked the public for their support and says he wants to wait for the coronial inquest, before commenting on the actions of Dreamworld.
"Like everyone else in Australia, we want to know what went wrong we want to know why our loved ones were taken from us in such horrific circumstances."
Mr Goodchild asked Dreamworld to contact his solicitor if they want to make any further contact with the family.
Meanwhile on the Gold Coast, police have continued their investigation at the park for a fourth day.
Queensland Police Commissioner, Ian Stewart told media the investigation may take some time.
"That investigation to some degree is growing in complexity," Commissioner Stewart said.
He said a range of specialist investigators - some from external agencies - are now on the case.
Dreamworld was closed for another day, but staff were invited to attend a memorial service at the park and to pay their respects to the families.
At a media conference after the ceremony, Dreamworld CEO Craig Davidson defended the operator of the Thunder River Rapids ride, in response to mounting questions about their ability and actions that day.
"The ride operator in control of the Thunder River Rapids ride was an experienced operator with the competency and training to operate that ride." said Mr Davidson.
He's confirmed that Dreamworld will be closed until at least after the funerals - a decision made by Dreamworld's parent company's boss, Deborah Thomas.
The Ardent Leisure CEO laid flowers at a growing tribute to the victims near the park entrance.
She also admitted they may have fumbled their efforts with the families, following confusion at the company's Annual General Meeting yesterday on whether or not she had spoken with the families.
Mr Thomas had said she had been in contact with the family through the police liaison.
But the Araghi family and the Dorsett family rejected this claim, saying they had not been contacted by Dreamworld or Ardent Leisure.
"If I hadn't handled it as well as I could, we thought we were doing the right thing in terms of the way that we approched it through the police," said Ms Thomas.
-With AAP
