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Leading up to Super Bowl Sunday, some sports columnists and football aficionados are having a field day with the "Harbowl."
John Harbaugh, coach of the Baltimore Ravens, will face off against his 15-months-younger brother Jim, head coach of the San Francisco 49ers.
Some football fans are complaining that the storyline is overhyped. And the brothers themselves reject it, emphasizing their bond.
Still, the super siblings will make history when their teams duke it out this weekend at the Mercedes-Benz Superdome in New Orleans.
People all over the world love a good story of a brotherly feud, whether fictional or real. We decided to take a look at some of the biggest ones.
Cain and Abel. Jacob and Esau. Joseph and his brothers. Moses and Pharoah (they grew up together). Not to mention Isaac and Ishmael. If you're looking for brother vs. brother rivalry, no better jumping off point than the Old Testament.
Thor vs. Loki
Comics and cartoons are home to numerous good vs. evil battles represented by two archetypal brothers. See the Lion King's Mufasa vs. Scar. Or the story at the core of last year's record-breaking blockbuster "The Avengers," based on Marvel comics. Loki, Thor's evil adopted brother, tries to terrorize all of humanity.
J.R. vs. Bobby
Sometimes you just loving watching the bad guy. On "Dallas," conniving J.R. Ewing was forever squaring off against his good-guy brother Bobby. The show's been resurrected with that battle at the center. But with Larry Hagman's death, J.R. vs. Bobby -- probably the biggest brother vs. brother rivalry in TV history -- will likely end as well, after the episodes Hagman already shot for the new season that began this week.
(Coincidental corporate synergy alert: The new "Dallas" is airing on TNT, which, like CNN, is a part of Time Warner.)
When brothers disband
Brotherly feuds have poisoned the waters for successful musical acts, including the Everly Brothers, which Rolling Stone calls "Rock's First Sibling Rivalry."
And more recently, similar bitterness helped bust the popular band Oasis. Liam and Noel Gallagher's feud included public spats and legal action. (See also The Kinks, the Isley Brothers and more in this spread from zencollegelife.com.)
Battle of the billionaires
Who doesn't hate feuding with their billionaire sibling over the future of a massive empire?
So we can all commiserate with Mukesh and Anil Ambani, who split up their father's Reliance Group and have fought to see whose vision for the future of Indian business will prevail.
Brotherly love trumps competition
I'll never forget watching the 1984 Olympics as a kid. Twin brothers Phil and Steve Mahre won gold and silver in the slalom at Sarjevo. After Phil finished his race, he used a walkie-talkie to give hints to his brother. I remember thinking, he wants his brother to do well more than he wants to be able to say he beat him. So, while rivalries abound, brotherly love can win out.
Sisterly feuds just as strong
We could of course double this list by looking at rivalries between sisters as well. A big one that's been in the news lately: Pauline Phillips, advice columnist behind "Dear Abby," passed away last month. Her twin sister was the equally famous advice columnist Esther "Eppie" Pauline Friedman Lederer known as "Ann Landers." They were locked in a feud for years.
What other sibling rivalries stick out in your mind? Let us know in the comments below.