He then called his siblings "disgruntled" supporters of Hillary Clinton, saying they "are related by blood to me but like leftists everywhere, they put political ideology before family".
Rep. Paul Gosar is Arizona's Republican Congressman for the state's Fourth District, but he's up for reelection in November and he's got a bit of an issue - 6 of his siblings are actively campaigning for his opponent.
Republican Arizona Congressman Paul Gosar might be a near lock for re-election, but not if his six siblings have anything to say about it. "Stalin would be proud", he tweeted.
Paul Gosar did not respond to requests Saturday for comment, but in a series of tweets Saturday afternoon, he wrote, "You can't pick your family".
In another tweet, he complained: "We all have insane aunts and relatives etc and my family is no different", before adding: "To the six angry Democrat Gosars-see you at Mom and Dad's house!"
The Daily Miner of Kingman, Arizona, thereafter published an open letter from Joan, David, Tim, Grace, Gaston, Jennifer and Pete Gosar (Pete doesn't appear in the ad above) distancing themselves from their brother.
In an interview with the Phoenix New Times, David Gosar had harsh words for his brother after the congressman suggested in the aforementioned Vice interview that George Soros bankrolled the neo-Nazis that marched on Charlottesville in 2017.
Gosar's 85 year old mother, Bernadette, told the New York Times that she was "crushed" by the ad for Brill. In it, six men and women discuss their various problems with Gosar as a candidate - before revealing that they're all his siblings.
Sad or not, other siblings piled on.
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Gosar is known for his extreme right-wing views, including the infamous birther conspiracy.
"I think my brother has traded a lot of the values we had at our kitchen table", said his sister, Joan, in the ad.
Dave Gosar, one of the six siblings who appear in the ad attacking Paul Gosar, also has a twitter account that he uses to troll his brother.
Videographers from Brill's campaign interviewed Gosar's siblings, but Brill said he was not personally involved with the ad, or the siblings' remarks.
"None of us are doing this for publicity", David Gosar told the Phoenix New Times on Friday.
Paul Gosar's other controversies include boycotting a 2015 speech to Congress by Pope Francis.
If there is a bright side for Mr Gosar, it's that he is one of 10 siblings. "This is about our family", Jennifer Gosar says.
He faces an uphill battle for the seat; Gosar trounced his Democratic opponent in the deep-red district in 2016, receiving 71.5 per cent of the votes.