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The once thisclose Manning brothers have taken sibling rivalry to a whole new level.

After learning that Eli had accused him of, among other things, being a "bastard," Peyton Manning fired back with a dramatic accusation—questioning whether Eli was even his brother at all.

"Do you think any real son of Archie's would get picked four times—three for TDs—in one game?," spat Peyton, referring to younger "brother" Eli's disastrous performance over the weekend against the Minnesota Vikings.

"He looks lost out there. Real Mannings don't look lost. You've seen the commercial, right?," Peyton continued, referring to an ad in which Arizona quarterback Matt Leinart is portrayed as extraordinarily close to Archie and Olivia Manning.

"Why do you think they used Matty in the commercial? Who do you think looks more like Archie, him or Eli?"

When asked about Peyton's stunning assertion, Archie Manning said, "Matty and Eli are both good boys." 

Olivia Manning offered a terse, "No comment."