CLEVELAND — Donald TrumpDonald TrumpMaria Bartiromo defends reporting: 'Keep trashing me, I'll keep telling the truth' The Memo: The center strikes back Republicans eye Nashville crack-up to gain House seat MORE’s children are going to bat for their dad, taking the stage at the Republican National Convention on Tuesday to make a public push for the official GOP White House nominee.

“Donald Trump has never done anything halfway, least of all, as a parent,” Tiffany Trump, Trump’s 22-year-old daughter with ex-wife Marla Maples, told the crowd.

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“The measure of a parent is based on how they support and bolster you when they’re down,” said Tiffany Trump, who has rarely stepped into the spotlight since her father launched his White House bid last June. “He motivates me to work my hardest and to always stay true to who I am and what I do.”

“Never let fear of failure get in the way,” the recent University of Pennsylvania grad added with a grin, “then you’ve pretty much figured out the Trump formula."

Trump’s oldest child, Donald Trump Jr., brought down the house with a speech that lauded his father’s business successes from a personal perspective.

“For too long, our country has ignored its problems, punting them down the road for future generations to deal with,” he said as he recalled a childhood growing up on construction sites and in conference rooms. “We need to elect a man who has a track record of accomplishing the impossible.”

“I’ve seen it time and time again — that look in his eyes when someone says it can’t be done,” the 38-year-old businessman and son of Trump ex-wife Ivana continued. “I saw that look a little over a year ago when he was told he couldn’t possible succeed in politics.”

“His unwilling determination is why he’s going to become the next president,” Donald Trump Jr. declared. “And why I know when my father says he’s going to fix the country, he means it."

The speeches came the night after another Trump family member, the real estate mogul’s wife, Melania, faced intense scrutiny over her convention remarks. Portions of the Monday night address closely mirrored parts of a speech Michelle ObamaMichelle LeVaughn Robinson ObamaJill Biden remembers her father, celebrates President Biden on Father's Day Michelle Obama shares Father's Day tribute: 'Our daughters couldn't have asked for a better role model' Jill Biden, Kate Middleton to meet this week MORE gave at the 2008 Democratic National Convention. The Trump camp denied that Melania Trump or any speechwriting team had plagiarized the address.

Two other of Trump’s five children are expected to address the convention this week. Eric Trump is scheduled to deliver a speech on Wednesday, while eldest daughter Ivanka has been tapped for a speaking role on the final night on Thursday.

Youngest son Barron might have struggled to reach the top of the podium: the child of Melania and Donald Trump is 10.