Prime Minister John Key implied that mould problems in some Housing New Zealand homes could be caused by tenants not ventilating them enough, something his widowed mother was vigilant about in their Christchurch state house.
He also rejected claims by Labour that the Government was making "a profit" from Housing New Zealand because it took a dividend.
Labour leader Andrew Little zeroed in on Mr Key's upbringing in a state house in an attempt to highlight recent cases of mouldy state houses.
Mr Little: Did the state house he grew up in have mould and leaks, and is it okay for kids today to live in mouldy, leaky, cold state houses because of lack of maintenance?
Mr Key: No, not from memory. Obviously, the house would have been much more modern back then, given it was so many decades ago. But also I will say that my mother took absolute pride in making sure that she kept the house clean, tidy, and ventilated.
He added that the Government was proud of the fact it was spending $300 million a year "improving the mess we inherited from Labour. Its own house was never in order".