"Four years ago, Theo and I were incredibly proud of Uncles Don and Eric and Aunt Tiffany. Nothing has changed! They brought the [fire emoji] this week! #RNC," wrote on Wednesday.
– along with First Lady – have spoken at the convention this week, with Ivanka scheduled to take the stage on Thursday night.
On the opening night of the convention, and called Joe Biden "the Loch Ness monster of the swamp."
Melania Trump headlined the second night, with the president sitting in the front row to watch her speech in the Rose Garden.
She expressed sympathy for those grieving lost loved ones during the and recounted her journey as an immigrant to the .
The president’s two middle children, Tiffany and Eric, both spoke before Melania on Tuesday, offering an indictment of the media and listing their father's accomplishments.
Ivanka is set to speak and introduce Trump on Thursday night, just like she did at the 2016 convention.
The president's daughter's tweet on Wednesday that withheld praise for Melania added to the speculation that the two have a complicated relationship.
Former FLOTUS aide Stephanie Winston Wolkoff is releasing a that claims she has recordings of slamming the president and his family.
, Melania fumed that Ivanka tries to steal the spotlight and behaves like she's on The Apprentice.
A source connected to the book told about the issues Melania has with her eldest stepdaughter.
The insider said: "Melania complained that Ivanka was always competing with her for his attention, as if she knew better and was more capable of being the First Lady.
"Melania spoke out against Ivanka's incessant need to involve herself in just about everything in , even if it didn't concern her.
"She would always find some way to meddle, some way to make her point be heard."
The source added: "Melania said Ivanka has not shown her the respect a First Lady deserves and is constantly trying to steal the spotlight by overstepping her boundaries and behaving like her father's most trusted confidant a la The Apprentice.
"Behind Ivanka's back, Melania would often grumble to her inner circle that there's only one First Lady and that her husband was the person elected, not his entire family, referring to his kids."
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The author also has secretly recorded tapes of Melania trash-talking the president.
According to journalist , the recordings are talked about in Wolkoff's book titled, Melania and Me: The Rise and Fall of My Friendship with the First Lady.
The highly-anticipated tome will be released on September 1.