The Taranaki family, which has traditionally purchased Lotto tickets several times a year, confirmed on Saturday a $ 12.5 million prize for Poverball.
The family who wanted to remain anonymous said that they had bought a ticket as a union when they had occasionally merged.
With a family meeting in Nev Plimouth on Saturday, they bought a winning card in the afternoon.
"We left coffee and shopping and we decided to stop Fitzroy Lotto & Mags from collecting our family ticket," one sister in the family said.
"I just put it in my wallet and forgot to be honest."
One of them noticed on Facebook that evening that Poverball tickets were sold in the same store.
"I went over the house and told my sister that we bought our ticket from the winning store," said the sister.
"We tried to calm ourselves by telling ourselves that it was probably someone else, but all we wanted was to check that card."
Unfortunately, the map was in their sister's house all over the city and it was too late to call. They had agonized waiting overnight to check it out.
"We were sitting in the salon in our pajamas watching rugby, when I received the text from my sister who let me know that Fitzroy sold the winning card and asked if I had checked it," said the sister who bought the ticket.
"I did not hurry to check if it started, but from my message I could say that she really wants me, so I thought it was better to do it."
After checking the numbers, she promptly made her sister, saying she was "better off".
"She thought I was joking first," she said.
"I was so sure she led us," said another sister.
The family entered the card holder's house in clothes and slippers.
"They appeared on my door later … I gave them a ticket and we all just stood in a place that is cheerful and embraced," said the sister who bought the ticket.
They held the map hidden in a safe a week before they asked for it at Lotto NZ headquarters today.
They plan to use money to take care of wider families, including the generations to come.
"This win is an incredible gift and we want to make the most of it. It's an incredible feeling that they know that our kids and grandchildren will not have to count every penny," said the winners.
"I'm sure he will eventually sink, but for now we can hardly believe. We feel incredible, incredibly happy."