If it comes down to the wire in New York’s primary election, Donald Trump may not be so forgiving of his children’s apparent oversight.

Mr Trump, the Republican frontrunner, has revealed that two of his five children, Ivanka, 34, and Eric, 32, failed to register in time for next week’s primary. He said they had missed the deadline, even though their father announced his candidacy almost 10 months ago.

“They had a longtime register and they were, you know, unaware of the rules, and they didn't register in time,” Mr Trump told Fox News. “So they feel very, very guilty.”

He added: “But it’s fine. I understand that. I think they have to register a year in advance and they didn’t. So Eric and Ivanka, I guess, won’t be voting.”

According to New York’s Board of Elections, new mail-in registrations to vote were due by 30 March for the 19 April primary. The deadline to change party enrollment was 9 October 2015 – the earliest change-of-party deadline in the country.

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Mr Trump said his other son, Donald Jr, was registered to vote.

Mr Trump is currently far ahead of his Republican rivals in the latest polls in New York and he is looking to add to his delegate tally both here and in Pennsylvania. An average of polls collated by data website Real Clear Politics puts him on 53 points in New York, ahead of Ohio Governor John Kasich on 21 and Texas Senator Ted Cruz on 19 points.

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Mr Trump was asked if he had punished his children for their oversight.

“Yes. No more allowance,” he responded.