NSW police have confirmed the body of the missing five-year-old has been found in the Murray River at Moama.
Five years old, he's barely lived, ' one woman said after she and her young daughter placed a bouquet of flowers on a chain metal fence overlooking the river, off Perricoota Road.
At 10pm, their mother, who can not be identified for legal reasons, presented herself to a police station in Echuca on the Victorian side of the river.
A 27-year-old mother has been charged with attempted murder, with an additional murder charge expected to be laid, after police allege she tried to drown her two young sons in the river.
The mother appeared before the court earlier on Saturday where she was formally refused bail, according to NewsCorp.
Mr Brooks said the grandparents were in a state of shock but rallying behind their older grandson, who is in a stable condition at the Royal Children's Hospital in Melbourne.
Their house in Deniliquin had become a refuge for the two boys about 18 months ago after they took them into their home.
It is alleged she then held him under the water in an attempt to drown him.
Police arrived on scene just after 7pm Thursday, where they found the older boy suffering severe dog bite wounds, and the mother and the five-year-old boy missing.
On Wednesday, the 27-year-old mother - whose name can not be published for legal reasons - allegedly took the children from the home of their grandparents in Deniliquin, in southern NSW.
Dale Brooks, representing the children's grandmother, said the boys' mother had been living in a caravan on the back of the grandparents' property in Deniliquin since she was released from jail in February.
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"So far the search has involved searching the riverbank where [the boy] was last seen as well as using Victoria Police divers to search the river".
Detective Sergeant Swinton said the woman made full admissions to her role in the incident, and told police of her "intention to kill both children".
In court, witnesses said she told them that she "had to drown my babies".
The distraught owner of the dog, named Buddy, told reporters the pit bull was trying to save the boy.
Detective Sergeant Trent Swinton told the court the younger son, 5, was screaming during the incident.
As he ran up the bank, he was "savagely mauled" by a dog, who then attacked the mother as she turned her focus to her youngest son.
A neighbour outside the court on Saturday, said it was impossible to imagine what the grandmother of the children was going through.
"The dog is four years old and it's never attacked one person, has grown up with kids, and it's always been around kids playing", she said. "We want answers", she said.
But there's nothing but sympathy for the 27-year-old's mother and stepfather - the grandparents of the child found dead in the river and the other in hospital in Melbourne.
Deniliquin Superintendent Paul Condon said the tragedy will be felt around the country.
"I think they (the agencies) have some culpability in this case".