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Jacinda Ardern and Grant Robertson with the rest of the cabinet at their first meeting after the 2020 election. Photo / Mark MitchellJacinda Ardern and Grant Robertson with the rest of the cabinet at their first meeting after the 2020 election. Photo / Mark Mitchell

The coalition relationship between NZ First and Labour could swing from cohesive to fractured in a single day, says Grant Robertson. Photo / Mark MitchellThe coalition relationship between NZ First and Labour could swing from cohesive to fractured in a single day, says Grant Robertson. Photo / Mark Mitchell

Grant Robertson with his mother Yvonne at Labour's conference in Whanganui in 2019. Grant Robertson with his mother Yvonne at Labour’s conference in Whanganui in 2019.