Mary Trump came to the defense of her brother Fred Trump III after his tell-all released Tuesday angered their cousin Eric Trump.

In “All in the Family: The Trumps and How We Got This Way,” Fred paints his famous uncle, Republican presidential candidate Donald Trump, as a bigoted man who lacks compassion.

Fred claims that when he needed financial help to support his disabled son, Donald Trump suggested the medical care might not be worth the cost.

Trump’s middle son, Eric, responded to that characterization on social media, calling the author an ingrate who happily accepted money, gifts and “decades of unwavering love,” only to “cash in” on a book deal with the presidential election just four months away.

Mary Trump — who also wrote a book berating her uncle in 2020 — responded to the attack on her brother, calling Eric “beneath my contempt” then taking a few shots at him anyway.

“If Eric had any self-awareness, he would’ve kept his mouth shut,” she said in a video posted to YouTube late Thursday.

Mary alleges that after their father, Fred Trump Jr., died in 1981, she and her brother were later cheated out of their share of family patriarch Fred Trump’s inheritance and blames the rest of the family for Fred III needing money to support his son. She also accuses Eric Trump of using his position of influence to “punch down” at her brother.

“He’s weak and he’s cruel in the way of small, unaccomplished men,” Mary Trump said.

Eric previously dismissed Mary as a loose cannon when her book came out four years ago.

“Every family has one,” he wrote on X in July 2020.

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