New Zealander mother was killed at Dreamworld while her young son watched the ordeal unfold.

New Zealand woman Cindy Low was this morning named by media as the fourth victim of Tuesday’s horrific accident at Dreamworld. Tragically, it’s now being reported that her 10-year-old son witnessed her final moments.

According to The New Zealand Herald, the boy was on the Thunder River Rapids ride with his 42-year-old mother when their raft flipped killing the four adults on board.

The boy was reportedly flung from the raft, but is believed to have seen his mother’s fatal fall, according to Fairfax Media.

Authorities this morning confirmed a 10-year-old boy and a 12-year-old girl survived the accident – an outcome police described as “close to a miracle”.

The 12-year-old girl is believed to be the daughter of Kate Goodchild, 32, who was killed along with her brother, Luke Dorsett, 35, and his partner Roozbeh Araghi, 38.

Three of the victims of the Dreamworld tragedy -  Luke Dorsett, Roozbeh Araghi and Kate Goodchild. Images: Facebook.

The New Zealand Herald is reporting that Low's son has been discharged from Gold Coast University hospital, where his father and sister were by his side.

The Sydney-based family of four were reportedly attending the theme park yesterday as part of a holiday to the Gold Coast. The father and daughter were seated in a separate raft at the time of the incident.

Low and her husband moved to Australia a decade ago from their native New Zealand, and shocked relatives are reportedly on their way to Australia to support the grieving family, according to The Herald.

Investigations into the accident are ongoing, but initial reports suggest it occurred when two rafts on the family-friendly attraction collided shortly after 2pm Tuesday afternoon.

Authorities believe two people were flung from the raft and two became trapped on the ride's conveyor belt, ABC reports.

Police Assistant Commissioner Brian Codd today told media the two children were lucky to be alive.

"It is almost a miracle that anybody came out of that," he said.

"Coming to a place where families want to come and enjoy each other's company and just have fun doesn't really equate to such a tragedy as we've seen."