Whare broke from New Zealand camp on Tuesday before returning to Wellington two days later to rejoin the side in time for their final training session.

Coach Stephen Kearney allowed Whare to visit Sydney to watch partner Natasha give birth to Zahlia, a younger sister to Mia who turns two next month.

"The start of the tour I knew my Mrs was due soon," Whare said. "I let [Kearney] know and he was 100 per cent behind me.  He gave me the time off and it was a little bit of a freshen up. I was comforting my partner. It gave me a lot of energy and motivation to try and not win this just for my country and the boys but for my family."

Whare missed just one training session while in Sydney. The Penrith centre considered pulling out of the tournament so he could guarantee his presence at the birth.

"If my partner was going to give a natural birth I would have stayed home but lucky enough she was booked in for a caesarean so the date was booked in and everything was ready to go," Whare said. "She let me come here which was good for me.

"I missed the Wednesday [training] session. We've been playing since February so I don't think it would make a difference if I missed one session. I was happy that I had a nice little healthy girl."

Whare played a starring role in helping the Kiwis secure their first piece of international silverware since 2010 when they claimed the Four Nations with a 22-18 victory against the Kangaroos on Saturday night. He kept the dangerous Michael Jennings at bay and minimised the impact of Australia's best attacking option.

"Both of them coming on the same week is pretty awesome and pretty surreal," Whare said. "I haven't been in a final since back in school days. To win one is even better.

"I'm always thinking about my family and they were definitely going through my mind during the game."