The family conflict probably will begin shortly before the national anthem.
Danielle Kalil will step to the microphone at Sunday's game between the Vikings and the Carolina Panthers at the Metrodome to belt out the "Star Spangled Banner."
On one sideline will be older brother Ryan, a Pro Bowl center for the Panthers. On the other will be younger brother Matt, a Pro Bowl offensive tackle for the Vikings. Family members, including parents Frank and Cheryl, will be in the stands.
Danielle's jersey will be an indication as to how the family is divided for the first meeting between the brothers as NFL players.
"It's my home game, so they're wearing Vikings stuff," Matt said. "I told my sister, she better have a Vikings shirt or jersey on. Better be no Carolina stuff this game."
Ryan laughed when he heard that but admitted it was possible: "Hey, I've been trying to bribe her all week to wear Panthers stuff."
Ryan, 28, was a second-round choice (59th overall) by Carolina in 2007 and has made three Pro Bowls. He missed most of last season because of a foot injury, but his brother calls him "probably the best center in the NFL."
Matt, 24, was the fourth overall pick by the Vikings last season. At 6-7 and 305 pounds, he's 5 inches taller (and 5 pounds heavier) than Ryan.