Their father was Glenn Pink and their mother was Jaze Pink, formerly Jaze Watene, a former student of Auckland's Long Bay College.
"Tragically our beautiful nieces and nephew died in a head-on collision with a semi-trailer fuel tanker this morning," their uncle Justin Watene said on a GoFundMe page set up after the crash.
"As you can imagine this is an incredibly difficult time for their parents," he said.
"Jaze and Glenn are good people with an amazing family. Burdened with life troubles. Life is not easy. What they do is everything for the kids. To lose one would be crazy. They lost three in one split second... just out of this world."
Justin Watene said the parents were great people.
"Their sacrificial love for their kids knows no bounds. This is a crushing blow." He set up the funding page so the couple could take time off work to grieve.
Queensland Ambulance Service said two people, including the driver of the fuel tanker, were taken to Goodiwindi Hospital in a stable condition after the crash.
Police are investigating and have referred the deaths to the coroner.
By about 7am (NZT) today, more than AU$52,000 ($54,000) had been donated by generous members of the public overnight.
The Pink family are understood to work on the show circuit, with local media reporting they were returning to Queensland after a show in Dubbo.
Many people involved in that community have paid tribute to the siblings as well as the family, who were well-known in the business.
People sharing memories and tributes about the teenagers have started to use the hashtag #LightItUpPink in social media posts and have changed their profile photos to show a hue of pink, in honour of the family.
The Showmens Guild of Australasia said the deaths were "an enormous loss" to the community.
A guild spokesman said yesterday was the darkest day their community had ever seen.
"We are a small community and we are very close to one another and everyone is affected by this.
"They were really beautiful kids, beautiful teenagers, well respected, hard working kids and everyone is mourning. They were part of a beautiful family."
One friend said: "This will rock the show community to no end. The Pink family are well-respected within the industry and the family have represented the Showmens Guild for many, many years.''
How to help
Visit gofundme.com/pink-family-support