Brothers Jim and John Harbaugh will go headset to headset at Super Bowl XLVII on Sunday, Feb. 3.
Jim Harbaugh coaches the San Francisco 49ers while big brother John coaches the Baltimore Ravens.
John Harbaugh even pranked his family and the media by calling in on a media conference call Thursday. One interpretation: His sense of humor one-upped his little brother!
All this is producing — in football circles and American circles — interesting dinner table chat.
Tell us about the time your sibling rivalry came to a head. Share a photo of you and your sis or bro.
And if you're a 49ers fan and your sibling is a Ravens fan, is that stirring up some trash talk?
Post in our comments below or on the Walnut Creek Patch Facebook page.