But that's exactly what will happen in two weeks when John Harbaugh's Ravens and Jim Harbaugh's San Francisco 49ers meet in New Orleans for Super Bowl XLVII.
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The 28-13 victory in Foxborough, Mass., not only set up the first brother-against-brother showdown in Super Bowl history, it also guaranteed that linebacker Ray Lewis' glorious 17-year career as the face of the Ravens will end on the biggest stage possible.
Lewis, who announced his coming retirement just before the playoffs, beamed on the sidelines as it became clear he would play another game. Ravens fans who had traveled to Foxborough serenaded their team with its unofficial theme song, "Seven Nation Army."
"For me to come out for my last ride and go to a Super Bowl my last ride, I can only tell you I'm along for the ride," Lewis said after the game.
In Baltimore, hundreds of fans spilled onto the streets of Federal Hill to celebrate the win.
"They said we couldn't do it," said city resident Candiss Kiah as she watched the last seconds tick away in Nevin's Cross Street Station. "We're always the underdogs. Maybe when we win the Super Bowl they'll stop saying that."
Quarterback Joe Flacco played another exceptional road playoff game in leading the Ravens back from a 13-7 halftime deficit. The Patriots and their sure Hall-of-Fame quarterback Tom Brady had no answer as Flacco finished three straight drives with touchdown passes.
The Ravens had craved a chance to rewrite the ending of last season, when they left Foxborough in defeat after a stripped touchdown pass and a missed 32-yard-field-goal attempt in the game's waning seconds. After 12 months of debilitating injuries, abrupt personnel changes and wildly inconsistent play, they somehow found themselves back on the same field against the same team, a trip to the Super Bowl again on the line.
The Ravens believed they were a more resilient team this time around. And sure enough, they did not allow the result to hang in the balance until the game's final moments.
"We came, we saw, we conquered," said linebacker Terrell Suggs as he tromped to the locker room after the game.
Jim Harbaugh kept his end of the bargain earlier Sunday when his San Francisco 49ers overcame a 17-0 deficit to beat the Atlanta Falcons 28-24 in the NFC Championship Game.
As John watched his younger brother's victory on the video screen in Foxborough, he offered congratulations via a CBS camera. "You're a great coach," he said to Jim. "I love you."
The brothers, separated by only 15 months, shared a bedroom as boys and learned the game from their father Jack, who assisted the great Bo Schembechler at the University of Michigan and went on to win a Division I-AA national title as the head coach at Western Kentucky.
Both men still mail game film to their father every week and await his notes on their respective teams.
Jim was the better athlete, a Heisman Trophy candidate at Michigan and an NFL quarterback for 15 years, including one with the Ravens. He also has the bolder personality, sometimes rubbing opposing coaches the wrong way with his competitiveness.
While Jim played in the NFL, John paid his dues as an assistant at five colleges and with the Philadelphia Eagles. He had begun to wonder if he'd ever become a head coach when the Ravens called in 2008.
The Harbaugh brothers have achieved remarkable success in their combined seven seasons as NFL head coaches. Neither has ever failed to make the playoffs. They met once before on Thanksgiving night 2011, a 16-6 Ravens win at M&T Bank Stadium. Fueled by the family storyline, the game drew the largest audience in the history of the NFL Network.