Brothers Jim and John Harbaugh will face off at Super Bowl XLVII on Sunday, Feb. 3.
Jim Harbaugh coaches the San Francisco 49ers while his older brother, John, coaches the Baltimore Ravens.
That might produce some interesting dinner table conversations.
Tell us about the time your sibling rivalry came to a head.
And 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 emotions?
Post here or on our Facebook page.