Britain, meanwhile, said in April that a "small number" of British children had left Syria and returned to the United Kingdom via other countries in the past year, but British officials were not involved in helping them leave ISIL-held territory.
"The fact that parents put their children into harm's way by taking them into a war zone was a despicable act", he added.
"As I have said repeatedly, my government would not allow any Australian to be put at risk".
Her lawyer Robert Van Aalst said he hoped Nettleton was with the children in Iraq, but had no direct communication with her due to security concerns.
"The families do understand that some sections of the Australian public have fears and apprehension about the return of our young citizens", they said.
Local media reported that the group included five children and grandchildren of Sydney-born convicted ISIL member Khaled Sharrouf and three children of fellow fighter Yasin Rizvic, from Melbourne.
European countries have been repatriating such children in recent months, after ISIS lost its last stronghold in the village of Baghouz in March.
The organisation said at least 50 other Australian children and women linked to IS remain in camps in north-eastern Syria, including many who are sick and injured.
Clarke Jones, an Australian National University criminologist who specialises in radicalisation, said: "There are a lot of people who don't want them back at all".
This represents the first time Australian children of foreign fighters have entered Australia after rescue from the Syrian refugee camps. His two older sons - Abdullah, 12, and Zarqawi, 11 - are also believed to have died in the strike.
The children's mother, Mrs Nettleton's daughter Tara, died of medical complications in 2015. And she told me we were in Syria.
"I think that will be very challenging for the Sharroufs", Carroll said.
"We commend the government's commitment to bring these children home". "The profile and the publicity around this family will also make it quite problematic for them to just integrate back into normal life in Australia".
Khaled Sharrouf horrified the world in 2014 when he posted a photograph on social media of his young son clutching the severed head of a Syrian soldier.
She had an emotional reunion with them on the Syrian al-Hawl camp earlier this year as part of an ABC news documentary, in which the teenage ladies, 16 and 17, spoke of their needs to come.