You could call this the single biggest storyline in the history of the Super Bowl.
John and Jim Harbaugh are the first set of brothers to coach in the NFL. They faced each other in their first season (a one-in-four) occurrence and they will coach against each other in the sport's biggest game of the season. That's pretty incredible.
It goes without saying that the winner of this game has bragging rights in the family.
Jim is the athlete of the two. He quarterbacked for 14 seasons in the NFL, earning a Pro Bowl selection in 1995, the same year he led the surprising Indianapolis Colts to within a Hail Mary of the Super Bowl.
In fact, Jim started 12 games for the Baltimore Ravens in 1998, meaning he was a teammate of Ray Lewis.
But John, although not a player, has been the more successful coach, especially in the NFL. In five seasons as the Ravens head coach, he has reached the postseason all five years. He's won at least one game each year, reaching three conference championship games.
With a victory in Super Bowl XLVII, he will have recorded his ninth postseason victory in just five seasons, a feat made more impressive by the fact that he has never had an elite quarterback.
Then again, Jim's 49ers don't have an elite quarterback either. Colin Kaepernick is very good, but he's basically a rookie, as he barely played last season and just took over the starting job in Week 9.
The point is that Super Bowl XLVII is completely up in the air. Oddsmakers have the 49ers as 4.5 point favorites, but it's the Ravens who are feeling the high of an emotional ride through the postseason, a la 2011 or 2007 Giants or 2005 Steelers. Oh, and there's always the added effect of Ravens linebacker Ray Lewis retiring, win or lose, after the game.
You could make a pretty good case that the best-coached team will win this year's Super Bowl and I think that's exactly how it should be in the first-ever matchup of brothers in the Super Bowl.