Updated | Ivanka Trump and Donald Trump Jr. were embroiled in a battle to take away inheritance money from their sister, Tiffany Trump, according to a new archive of the conversations Donald Trump had on-air with The Howard Stern Show.

Donald Trump told Howard Stern that Ivanka and Donald Jr. weren't happy when they discovered they'd have another sibling, and agreed when Stern asked whether the two were working together to "bump off a child."

"Do your older children get nervous every time you have another child?" Stern's longtime co-host, Robin Quivers, asked, referring to the children's inheritance. Every time Donald Trump has another child, the others are at risk of receiving less money. Exactly how much the Trumps will be inheriting is up for debate.

"I have a friend who is also like a very rich guy," Trump said to Stern, according to the tapes. "And he said how his children hate the new children coming along and everything else; I said, 'Yeah, because every time you have a child, it's 20 percent less to the people [Inaudible].'"

The conversation quickly switched paths to the subject of "making love to Melania during the pregnancy," but not before serving one last, swift blow to Tiffany Trump.

Stern asked Trump if Donald Jr. and Ivanka were trying to "bump off the other child."

Trump responded by saying, "Tiffany is great. I have a great child. And Tiffany, I have great children."

"Tiffany has taken out a hit on Melania's new baby. Is there any truth to that?" Stern asked. Trump shot back, "Well, you know, it does cut up the pie as you keep producing."

If Tiffany doesn't lose her inheritance, Donald Trump said she and the rest of the Trumps would receive at least Trump Online University and Trump Ice, according to the tapes. After multiple lawsuits, Trump University is now defunct. Trump Ice, a bottled-water brand with Trump's face taped across the bottle, is still in business.

Newsweek exclusively obtained this previously unreleased audio and transcript from December 2005 from The Howard Stern Show, along with 15 hours of Trump talking to Stern from 1993 to August 25, 2015. An anonymous person sent the audio file earlier this month of the individual Trump-Stern interviews by Dropbox to the website Factba.se. The site developers requested the Stern-Trump interview audio files on Stern fan sites and Reddit earlier this year. It was made searchable for Newsweek before they were public for the first time on Monday.

Tiffany is the daughter from Trump's second marriage, to Marla Maples. She grew up with her mother in California.

This isn't the only time Tiffany has been the odd one out in a family of Trumps. On Election Day, Donald Trump said he was proud of Tiffany "to a lesser extent" than his other children.

"I'm very proud, because Don and Eric and Ivanka and—you know, to a lesser extent 'cause she just got out of school, out of college—but, uh, Tiffany, who has also been so terrific. They work so hard," he told Fox News.

Correction: An earlier version of this story incorrectly attributed a quote to Howard Stern that was said by his co-host, Robin Quivers, because of an error in a transcript.