"These disgruntled Hillary suppporters (sic) are related by blood to me but like leftists everywhere, they put political ideology before family".
"Stalin would be proud", he added.
The advertisement, titled "A Family Defends its Honor", featured Jennifer, Grace, David, Joan, Tim and Gaston, Gosar's siblings.
Next up is "Jennifer, medical interpreter" who says "If he actually cared about people in rural Arizona, I bet he'd be fighting for social security, for better access to healthcare".
One ad for Brill racked up over 868,000 views on YouTube by Saturday afternoon.
The Phoenix New Times reported that the ad and others were unveiled at a fundraiser in Phoenix on Thursday night - and that in another spot, which is not public yet, Grace Goser says that "it would be hard to see my brother as anything but a racist". The ad is not yet online.
The siblings - Tim, Jennifer, Gaston, Joan, Grace and David Gosar- say they are making a values-based endorsement of Brill, and that their brother is too extreme in his views.
In another spot, the Gosar clan discusses how hard (but necessary) it is for them to join forces against their brother.
"I couldn't be quiet any longer, nor should any of us be", said sister Grace Gosar.
He regularly tweaks his politician brother on Twitter, calling him "Weasel".
David Brill, an Arizona Democrat going after Republican Rep.
David Gosar didn't predict that the ad campaign would spark a national political conversation.
The Gosar family was raised in Wyoming, where numerous siblings still live.
Brill won the nomination in August and was harshly critical of Gosar during the primaries. "If you can't speak out against your family, then don't be a hypocrite and speak out against someone else's family member". We all have insane aunts and relatives etc and my family is no different. "To the six angry Democrat Gosars - see you at Mom and Dad's house!"