The NSW parliamentary law and justice committee will travel to Bowraville, on NSW's mid north coast, on Monday as part of its inquiry into the murders of three Aboriginal children more than 20 years ago.
Colleen Walker, 16, Evelyn Greenup, 4, and Clinton Speedy, 16, all disappeared over several months in the early 1990s.
The bodies of Evelyn and Clinton were discovered in bushland in early 1991; Colleen's clothes were found weighed down in the Nambucca River, but her body has never been found.
The families of the children want to highlight the injustice done to their loved ones.
The committee announced an inquiry late last year to hear from the families of the victims.
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Evelyn's relative Michelle Jarrett hopes to show the injustice done to the three children.
"They have no justice no where and it's still an open wound for our families," she told ABC Radio.
In 1991, Bowraville man Jay Hart was charged with the murders of Evelyn and Clinton, but was acquitted of murdering Clinton in 1994.
Shortly afterwards prosecutors also dropped the charges relating to Evelyn.
After an inquest into her death in 2004, Mr Hart was again charged with Evelyn's murder and then acquitted.
The committee has said that its inquiry is not a murder investigation and will not be reviewing any decisions made by the Attorney General and NSW police.
Leonie Duroux, Clinton's sister-in-law, said the families had never had an opportunity like this.
"We are going to use it to our full advantage and if something comes of it, we will be extremely happy," she told the ABC.
"I just want them to listen and go away from it and think `yes something has to be done and we have to make some changes'."
The committee will hold public hearing on May 1.
