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Arizona Congressman Paul Gosar, a Republican from the party's most conservative wing, is standing for re-election in November.
Fearing for the future, his siblings have thrown their weight behind their choice of candidate in a powerful new TV advert.
The striking part? It's not their brother.
Nope - six of Mr Gosar's siblings have spoken out to endorse his rival, Democrat David Brill.
If that sounds brutal on paper, the execution is even more savage. To maximise its impact, the ad doesn't name the six speakers until the end - they're just presented as normal Arizona folks.
It opens with "Grace, rural physician", declaring, "Paul Gosar the congressman isn't doing anything to support rural America."
"Paul's absolutely not working for his district," says "David, lawyer".
"If he actually cared about people in rural Arizona, I bet he'd be fighting for social security, for better access to healthcare," agrees "Jennifer, medical interpreter".
"He is not listening to you, and he does not have your best interests at heart," "Tim" agrees - before dropping the bombshell line: "My name is Tim Gosar".
So is this a shock move from David, Tim, Jennifer, Gaston, Joan, and Grace?
Local paper the Arizona Republic calls it "brutal, but not unexpected". Mr Gosar made headlines after the violent neo-Nazi rally in Charlottesville, Virginia, in August 2017, by suggesting it was planned by "the Left" to undermine Donald Trump. He then branded Democratic Party donor George Soros a Nazi collaborator in an interview with Vice News.
Horrified, seven of his siblings signed an open letter to the Kingman Daily Miner, stating: "It is extremely upsetting to have to call you out on this, Paul, but you've forced our hand with your deceit and anti-Semitic dog whistle."
Paul Gosar's other controversies include boycotting a 2015 speech to Congress by Pope Francis. He criticised the pontiff's support for climate change, calling it "questionable science" deployed "to guilt people into leftist policies".
He has also defended British far-right activist Tommy Robinson, and attacked "disgusting and depraved" Muslim immigrants at a speech in London in July.
Further anti-Gosar adverts set to air on TV soon include one titled "A family defends its honor," where David Gosar says: "We've got to stand up for our good name, this is not who we are."
"It would be difficult to see my brother as anything but a racist," Grace Gosar says in another, according to the Phoenix New Times.
Representative Gosar has not yet responded to the ad campaign. The Republican, who won his district with 71% of the vote in 2016, is still considered likely to keep the seat he has held since 2011.
If there is a bright side for Mr Gosar, it's that he is one of 10 siblings. While seven have denounced him in public, two are keeping their silence so far - which might make Christmas fractionally less awkward.