Sunday will mark the first time two brothers play against each other in a Super Bowl.

Both Travis and Jason Kelce admitted last week they were already tired of hearing the narrative, but they both recognized the significance of the moment.

Now that the clock is officially ticking on kickoff, the two are enemies.

The brothers recorded their "New Heights" podcast together in Arizona earlier this week, saying it was the last time they would see one another before kickoff Sunday.

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Travis and Jason Kelce

Travis Kelce of the Kansas City Chiefs (left) and Jason Kelce of the Philadelphia Eagles. (Michael Owens/Tim Nwachukwu/Getty Images)

The Kansas City Chiefs tight end and Philadelphia Eagles center are team captains and will meet at midfield for the coin toss.

Despite being family, Travis is now all business.

"I'm just gonna act like I don't even know you," Travis said. "So, at the coin toss, don't f---ing look at me. Don't try to shake my hand. You are the f---ing enemy, bro."

Jason said he now knows Travis' weakness.

"Well, now I know what your game plan is, and I'm ruining your game plan," Jason responded. "Now that I know that's your strategy, I cannot wait."

The two took the time last week to reflect on the historic feat.

The Kelce brothers

Philadelphia Eagles center Jason Kelce, center, and Kansas City Chiefs tight end Travis Kelce, right, embrace during a game Oct. 3, 2021, at Lincoln Financial Field in Philadelphia. (Andy Lewis/Icon Sportswire via Getty Images)

"Did we think it was going to be both of us? I don't know. I thought it could happen. But I didn't ever really fully anticipate it happening until pretty much last week," Jason said on an episode last week. "I was like, ‘Man, this could really happen. We could really have a ‘New Heights’ Kelce Bowl, and we could actually be doing this.'"

"Which is wild and kind of surreal," the Kansas City tight end responded. "I feel like I've been getting asked this question my entire career. … My entire time, I'm like, that's been the goal is to play my brother in the Super Bowl. Now that it's actually happening, it's like, man, it's kinda sick."

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But, at the end of the day, as Travis noted, "Someone's gotta send their brother home, man."

The last pair of brothers to face off in a professional championship were Scott and Rob Niedermayer in the 2003 Stanley Cup Final. Scott's New Jersey Devils beat Rob's Mighty Ducks of Anaheim in seven games. The two won the 2007 Stanley Cup together with the Ducks.

Kelce brothers with mom

Mother Donna Kelce gives cookies to her sons Jason Kelce of the Philadelphia Eagles, left, and Travis Kelce of the Kansas City Chiefs during Super Bowl LVII Opening Night presented by Fast Twitch at Footprint Center Feb. 6, 2023, in Phoenix, Ariz. (Christian Petersen/Getty Images)

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Brothers Jim and John Harbaugh coached against each other in Super Bowl XLVII, and twins Devin and Jason McCourty played alongside one another in four Super Bowls with the New England Patriots.

Stephen and Seth Curry faced off in the 2019 Western Conference finals, while Aaron and Austin Nola went against one another in the 2022 National League Championship Series.