Stanford Cardinal head coach Jim Harbaugh, right, hugs his father Jack Harbaugh, as time expires against Notre Dame in an NCAA college football game in South Bend, Ind., Saturday, Sept. 25, 2010. Stanford defeated Notre Dame 37-14. (AP Photo/Michael Conroy)

San Francisco 49ers head coach Jim Harbaugh yells at an official during the second half of an NFL football game against the Dallas Cowboys in San Francisco, Sunday, Sept. 18, 2011. (AP Photo/Tony Avelar)

Baltimore Ravens head coach John Harbaugh works the bench against the Cleveland Browns in the second quarter of an NFL football game on Sunday, Dec. 4, 2011, in Cleveland. (AP Photo/Amy Sancetta)

Jack and Jackie Harbaugh are photographed at their home in Mequon, WI on November 7, 2011. (Todd Rosenberg/NFL)

San Francisco 49ers head coach Jim Harbaugh and Baltimore Ravens head coach John Harbaugh prior to an NFL football game at M&T Bank Stadium in Baltimore, Thursday, Nov. 24, 2011. The Harbaughs became the first brothers to face each other as NFL head coaches. (Ben Liebenberg/NFL)

The San Francisco 49ers celebrate with head coach Jim Harbaugh, center, after the NFL football NFC Championship game against the Atlanta Falcons Sunday, Jan. 20, 2013, in Atlanta. The 49ers won 28-24 to advance to Super Bowl XLVII. (AP Photo/Dave Martin)

Head coach John Harbaugh of the Baltimore Ravens celebrates against after defeating the San Diego Chargers during an NFL game on Sunday, November 25, 2012 in San Diego, CA. (AP Photo/Jed Jacobsohn)

San Francisco 49ers head coach Jim Harbaugh reacts to a call during the second half of the NFL football NFC Championship game Sunday, Jan. 20, 2013, in Atlanta. The 49ers won 28-24 to advance to Superbowl XLVII. (AP Photo/John Bazemore)

Baltimore Ravens quarterback Joe Flacco and head coach John Harbaugh celebrate after defeating the New England Patriots after the AFC Championship playoff football game at Gillette Stadium on Sun Jan.20,2013. (AP Photo/Tom DiPace)

Baltimore Ravens head coach John Harbaugh, left, and his brother, San Francisco 49ers head coach Jim Harbaugh, talk with their father, Jack, right, before their NFL football game in Baltimore on November 24, 2011. (AP Photo/Patrick Semansky)

San Francisco 49ers head coach Jim Harbaugh celebrates with tight end Vernon Davis (85) after Davis scored on an 18-yard touchdown reception against the Arizona Cardinals in the third quarter of an NFL football game in San Francisco, Calif., Sunday, Nov. 20, 2011. (AP Photo/Marcio Jose Sanchez)

Jackie and Jack Harbaugh, parents of San Francisco 49ers coach Jim Harbaugh, stand before an NFL football game between the 49ers and the Seattle Seahawks in San Francisco, Sunday, Sept. 11, 2011. (AP Photo/Paul Sakuma)

Baltimore Ravens head coach John Harbaugh is seen on the sidelines during the third quarter of an NFL AFC wild card football playoff game against the Kansas City Chiefs Sunday, Jan. 9, 2011, in Kansas City, Mo. (AP Photo/Jeff Roberson)

San Francisco 49ers head coach Jim Harbaugh gestures during the second half of an NFL football game against the Chicago Bears in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Tony Avelar)

Baltimore Ravens owner Steve Bisciotti, left, and coach John Harbaugh celebrate after the Ravens defeated the Jacksonville Jaguars 27-7 in an NFL football game, Sunday, Dec. 28, 2008, in Baltimore. The Ravens advanced to the playoffs with the win. (AP Photo/Rob Carr)

Baltimore Ravens coach John Harbaugh argues a call with an official during the second half of an NFL football game against the Pittsburgh Steelers on Sunday, Dec. 14, 2008, in Baltimore. The Steelers won 13-9. (AP Photo/Rob Carr)

San Francisco head coach Jim Harbaugh and brother Baltimore Ravens head coach John Harbaugh on the NFL Network set during the 2011 NFL Scouting Combine at Lucas Oil Stadium on Feb. 24 in Indianapolis, Ind. (Ben Liebenberg/NFL)

Baltimore Ravens head coach John Harbaugh talks with wide receiver Yamon Figurs during an NFL preseason football game against the St. Louis Rams on Saturday, Aug. 23, 2008, in St. Louis. The Rams beat the Ravens 24-10. (AP Photo/Kyle Ericson)

John Harbaugh, second from left, his father Jack, far left, wife Ingrid, and his mother Jackie, far right, motion for his daughter, Alison, to join them for a group photo after John was introduced as the new coach of the Baltimore Ravens football team during a news conference, Saturday, Jan. 19, 2008, in Owings Mills, Md. (AP Photo/Rob Carr)

Stanford Cardinal head coach Jim Harbaugh, left, celebrates after Stanford defeated California 20-13 in a college football game in Stanford, Calif., Saturday, Dec. 1, 2007. (AP Photo/Paul Sakuma)

Philadelphia Eagles special teams coordinator John Harbaugh talks during a news conference after practice on Aug. 30, 2006 in Philadelphia, PA. (AP Photo/George Widman)

Stanford Cardinal head coach Jim Harbaugh celebrates a touchdown Memorial Stadium in Berkeley, CA on Saturday, November 20, 2010. (Courtesy Stanford Athletics/StanfordPhoto.com)

Head coach Jim Harbaugh leads the Stanford Cardinal onto the field at Arizona State University, November 13, 2010 in Tempe, Arizona. (Courtesy Stanford Athletics/StanfordPhoto.com)

Western Kentucky Hilltoppers head coach Jack Harbaugh is pictured. (Joe Imel/WKU Athletic Media Relations)

David Shaw, Andrew Luck and Jim Harbaugh during Stanford's 48-14 win over the University of California, Berkeley, at Memorial Stadium in Berkeley, California. (Courtesy Stanford Athletics/StanfordPhoto.com)

A view of Jack and Jackie Harbaugh's home in Mequon, WI. (Todd Rosenberg/NFL)

University of San Diego head coach Jim Harbaugh instructs one of his players during a predawn workout Tuesday Feb. 3, 2004 in San Diego, CA. (AP Photo/Lenny Ignelzi)

Stanford Cardinal defensive coordinator Jack Harbaugh poses for a headshot in 1980. (Courtesy Stanford Athletics/StanfordPhoto.com)

Western Kentucky Hilltoppers assistant coach Jim Harbaugh is honored during Jim Harbaugh Appreciation Night in 1997. (WKU Athletic Media Relations)

Western Kentucky Hilltoppers assistant coach Jim Harbaugh is pictured. (WKU Athletic Media Relations)

Western Michigan Broncos head coach Jack Harbaugh � and assistant coach John Harbaugh are pictured. (Courtesy WMU Athletic Media Relations)

Western Michigan assistant coach John Harbaugh poses for a headshot. (Courtesy WMU Athletic Media Relations)

Western Kentucky Hilltoppers head coach Jack Harbaugh and assistant coach Jim Harbaugh are pictured. (WKU Athletic Media Relations)

University of Cincinnati Bearcats special teams coordinator John Harbaugh is pictured. (UC Sports Communications)

University of Cincinnati Bearcats special teams coordinator John Harbaugh is pictured. (UC Sports Communications)

A photo of Jim Harbaugh, quarterback for the Baltimore Ravens, and John Harbaugh, assistant coach for the Philadelphia Eagles, is on display at their parents' home in Mequon, WI. (Todd Rosenberg/NFL)

A photo of Jack Harbaugh (top row, third from right), assistant coach at the University of Michigan, is on display at his home in Mequon, WI. (Todd Rosenberg/NFL)

Baltimore Ravens quarterback Jim Harbaugh (4) poses for a team photo in 1998. Also pictured is linebacker Ray Lewis (52). (Baltimore Ravens)

Chicago Bears quarterback Jim Harbaugh (14) throws a pass during the NFL football against the Los Angeles Raiders on September 5, 1987 in Los Angeles, California. The Bears won the game 20-17. (AP Photo/Paul Spinelli)

Indianapolis Colts quarterback Jim Harbaugh celebrates their 10-7 victory over the Kansas City Chiefs Sunday, Jan. 7, 1996 at Arrowhead Stadium in Kansas City, Mo. The Colts now head to Pittsburgh for the AFC championship game Sunday. (AP Photo/Mark Duncan)

Stanford Cardinal defensive coordinator Jack Harbaugh is seen during practice. (Courtesy Stanford Athletics/StanfordPhoto.com)

Stanford Cardinal defensive coordinator Jack Harbaugh is seen during practice. (Courtesy Stanford Athletics/StanfordPhoto.com)

Heisman Trophy finalist Jim Harbaugh is held by Goofy, who sports the quarterback's jersey number, as the Michigan Wolverines tackled Disneyland on Saturday, Dec. 27, 1986 in Anaheim, CA during a break in their practice schedule for the upcoming Rose Bowl. (AP Photo/Bob Galbraith)

Western Kentucky Hilltoppers head coach Jack Harbaugh celebrates a home victory. (WKU Athletic Media Relations)