They said Mr Dallow's stepdaughter, 15-year-old Zoe Hosking, was also presumed dead on White Island.
Even after it ends, many questions lie ahead for Ngati Awa and their community in Whakatane, a town on the mainland, looking out over the Bay of Plenty to Whakaari, also known as White Island.
Queensland Premier Annastacia Palaszczuk released a statement on Wednesday saying she knows Julie and Jessica's family and was "deeply saddened" by the news of their death.
Oliver Peterson got the latest from Nine News reporter Lizzie Pearl.
The family is expected to give a statement this afternoon.
Of those on the island at the time of the eruption, 24 were from Australia, two were from the United Kingdom, four from Germany, two from China, one from Malaysia, nine from the US, and five from New Zealand.
Their family frantically called hospitals and authorities following the eruption after receiving no contact from them.
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A famed tourist attraction, the White Island volcano is one of several in New Zealand and thousands that encircle the Pacific.
Police said the official toll has risen to eight, with eight more missing and presumed dead.
We have been advised that there are no signs of life on the island.
Visitors at the time included a group of more than 30 from a Royal Caribbean cruise ship, the Ovation of the Seas, which left Sydney on a 12-day voyage last week with up to 4,000 passengers onboard.
White Island had been mined for sulfur until a 1914 accident in which at least 10 people were killed and a landslide destroyed the miners' village and the mine itself.
Twenty-seven of the 31 people injured suffered severe burns, the government said, amid fears some could succumb to those wounds.
A total of 30 people are now receiving treatment in hospitals across New Zealand.
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Clement said he could not give an assurance about the timeframe for recovering bodies, because of the status of the volcano and the risk of eruption.
'It is just devastating news, ' he told media.
"They want to bring people's loved ones home", Ardern said.
The first confirmed death was of a local man, Hayden Marshall-Inman, a guide who had shown tourists around the island.
The police is also required to follow the global process for disaster victim identification - including the formal examination and documentation of bodies at the scene to ensure they are correctly identified and all the necessary information is gathered for subsequent investigations.
Australian Prime Minister Scott Morrison said 11 Australians are unaccounted for and 13 were hospitalized.
Thick clouds of ash, steam and debris spew from New Zealand's most active volcano cone, 70% of which is underwater, according to New Zealand volcano agency GeoNet.
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GNS has reduced the volcanic alert status to level 2 but says the likelihood of another eruption in the next 24 hours remains.