Just in case the Trump family didn't already have the heads of Republican establishment types exploding, Donald Trump just announced that two of his kids, Eric and Ivanka Trump, didn't bother to register to vote as Republicans in New York, so neither will be able to vote for their father in next Tuesday's Republican primary. Who are Donald Trump's kids and why aren't they registered Republicans already?

"They were unaware of the rules and they didn't register in time," Trump told Fox and Friends. "So Eric and Ivanka, I guess, won't be voting. They feel very, very guilty. They feel guilty," Trump continued. "But it's fine. I understand that."

Even though Trump seemed to downplay the apparent oversight, it seems like a pretty big deal that Trump's own adult children — including Ivanka, the daughter he is always bragging about — didn't think voting for their dad was important enough to get registered. And, considering Trump is trying to sell himself as a long-time Republican, is it really that crazy of an expectation that his kids make sure they're registered to vote in the Republican primary? Did they forget to register? Or are they intentionally not voting on a technicality? The whole situation seems really strange to politicians and conspiracy theorists.

Trump has three kids from his first marriage to Ivana: Donald Jr., Eric, and Ivanka. His second wife, Marla Maples, gave birth to Tiffany and Trump's third, and current wife is mother to 9-year-old Barron. There are a total of five Trump children. Starting this week, the Trump campaign will start to introduce the Trump children to the public, starting with a CNN Town Hall on Tuesday, April 12, just a week before the New York Republican Primary.

Donald Trump Jr.

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SALT LAKE CITY - MARCH 18: Donald Trump Jr. waves as he is introduced on stage by his father, Republican presidential candidate Donald Trump, at a campaign rally at the Infinity Event Center on March 18, 2016 in Salt Lake City, Utah. The Republican and Democratic caucuses are March 22. (Photo by George Frey/Getty Images)

Donald Trump Jr. is the oldest of the Trump offspring and has had a tumultuous relationship with his father, much of the tension stemming from his father's acrimonious divorce from his mother, Ivana. Now Donald Jr. works for his dad and has emerged as an effective surrogate for the Trump campaign. Donald Jr. married Vanessa in 2005 and they have 5 kids.

Ivanka Trump

CORRECTION - Ivanka Trump speaks before the arrival of her father, US Republican presidential candidate Donald Trump, during a rally in Bethpage Long Island, New York on April 6, 2016. Trump looks to bounce back from his unsettling presidential primary los in Wisconsin, training his sights in the next White House contests on friendlier ground -- his home state of New York. / AFP / KENA BETANCUR / The erroneous mention[s] appearing in the metadata of this photo by KENA BETANCUR has been modified in AFP systems in the following manner: [daughter] instead of [wife]. Please immediately remove the erroneous mention[s] from all your online services and delete it (them) from your servers. If you have been authorized by AFP to distribute it (them) to third parties, please ensure that the same actions are carried out by them. Failure to promptly comply with these instructions will entail liability on your part for any continued or post notification usage. Therefore we thank you very much for all your attention and prompt action. We are sorry for the inconvenience this notification may cause and remain at your disposal for any further information you may require. (Photo credit should read KENA BETANCUR/AFP/Getty Images)

Ivanka is a 34-year-old former model, businesswoman, and mother — she gave birth just weeks ago to her third baby, Theodore. She's been called the "power behind the Trump Throne" and her father's "most influential adviser." When Trump wants to bring out a showstopper at one of his rallies, it's Ivanka that introduces candidate Trump rather than his wife, Melania. She is impeccably educated, poised, and polished — and will be a more front-and-center surrogate for the Trump campaign in the months ahead, despite her failure to register to vote in the New York primary along with her brother, Eric.

Eric Trump

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NEWMARKET, NH - FEBRUARY 08: Eric Trump visits with volunteers working to help elect his father Republican presidential canddiate Donald Trump at the Newmarket Trump campaign headquarters on February 8, 2016 in Newmarket, New Hampshire. Democratic and Republican Presidential are stumping for votes throughout New Hampshire leading up to the Presidential Primary on February 9th. (Photo by Joe Raedle/Getty Images)

Eric Trump, 32, the youngest of Trump's children with Ivana, is one of the kids who forgot to register to vote for his dad. He's an executive vice president for his dad's company, focusing on construction. He is also the founder of the Eric Trump Foundation, and owns a vineyard in Virginia, and it called, yep, you guessed it, Trump Winery. He is married to Lara Yunaska.

Tiffany Trump

tiffanytrump on Instagram

Tiffany is the 22-year-old daughter of Donald and his second wife, Marla Maples. Tiffany is a good student at her dad's alma mater, the University of Pennsylvania, and, thanks to some sweet family connects, got to intern at Vogue. Tiffany is also pretty prolific on Instagram.

Barron Trump

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PALM BEACH, FL - JANUARY 04: Donald Trump, Barron Trump and Melania Trump attends Trump Invitational Grand Prix Mar-a-Lago Club at The Mar-a-Largo Club on January 4, 2015 in Palm Beach, Florida. (Photo by Gustavo Caballero/Getty Images)

Barron Trump is just 10 years old and the only son of Donald and his current wife Melania.

Get used to seeing the Trump kids, because we've got a long way left to go until the November elections.