Rep. Paul Gosar blamed former president Barack Obama for the feud with six of his siblings rooted in Gosar’s controversial political style.

After appearing defiant over the weekend and touting his mother’s support for his “philosophy and policies,” the Arizona Republican admitted in an interview with KFYI-AM radio in Phoenix that it “does sting” to be rejected by three of his brothers and three of his sisters in a series of four attack ads released by his Democratic opponent’s campaign.

He pinned blame for the rift on Obama’s shoulders.

“It always hurts, Mike. You know, blood is supposed to be thicker than water,” Gosar told host Mike Broomhead. “But, you know, this actually details exactly what the left, what Barack Obama actually asked progressives to do, is to get into family and friends, in their face, and not let up.”

Gosar’s brothers David, Tim, and Gaston and sisters Joan, Jennifer, and Grace appeared in a series of four scathing ads released Friday distancing themselves from their brother in Congress and asking voters in his district to vote for his Democratic opponent, David Brill.