"And in terms of the Labor Party winning, and even winning his seat, is no lay-down misere either," Greg Rudd told 3AW on Thursday.

On the second-last day of the campaign, the Prime Minister became the subject of pop psychology – first from his own brother on radio and, later, at his own hand.

Asked how his brother would handle losing, Greg Rudd said: "Right from a very early age, Kevin doesn't handle defeat or rejection well. And that's only because – I wouldn't say that a weakness or anything wrong – it's just that he's filled with so much self-belief that what he's doing is right.

"So he won't handle it well, and he'll find it difficult to understand why – because the election won't just be small loss, I think it'll be a larger than small loss. And in his own head, I think he'll find it difficult to understand why that's occurred.

"So Kev will have a bit of a learning experience and a bit of a self-education experience to go through, but he is an intelligent guy, at heart he's a nice guy, and I think he'll come out of it OK."

Greg Rudd's perhaps unwelcome foray into his brother's campaign came as the Prime Minister addressed the National Press Club, saying Australia should fear a future under an Abbott-led government, and he appeared on ABC TV in a whimsical episode of Kitchen Cabinet.

Filmed two weeks ago, hours before Mr Rudd took security briefings on Syria, the episode – hosted by Annabel Crabb – showed Mr Rudd and his daughter Jess in relaxed form, baking chocolate brownies and talking about the importance of family.

Mr Rudd revealed that every decision he had made about what to do in life, had been worked through with his family.

"We actually mull these things over for a bit," he said. "We have formal family conferences when anyone wants to do anything significant. And so therefore we know what we're doing and why we're doing it, and if it works out that's terrific, and if it doesn't work out, you know that you've actually approached it with a reasonable motivations."

And, he said, he did not believe in holding onto anger or bitterness.

"You run into too many bitter and twisted people in life, whether they are in whatever profession, who just sort of carry around their lives this sort of burden or bucket of hatred, offences, real or imagined, slights real or imagined from way back when," he told Crabb.

"And you sort of say, hello, and then you realise you're entering into a zone of 25 years' worth of, you know, silent and anger and you think 'bah'."

Asked how he dealt with it, Mr Rudd said: "So for me, I just stick it into what Mum used to call her 'forgettery' – boof! Remember the old computer programs – it had the little rubbish bin at the top? Boof. Gonski."