Father, sons and football: Thanksgiving for Harbaugh family at M&T Bank Stadium

Ravens coach John Harbaugh watches Atlanta celebrate a last-minute touchdown, putting them ahead 26-10.

Ravens head coach John Harbaugh chats with offensive coordinator Cam Cameron (left) during training camp at McDaniel College.

Ravens coach John Harbaugh hugs 49ers coach Jim Harbaugh, his younger brother, after Baltimore's win over San Francisco.

Ravens running back Errict Rhett (left) and quarterback Jim Harbaugh meet the media.

The Ravens introduce Joe Flacco after drafing the Delaware quarterback with the No. 18 overall pick in the 2008 NFL Draft. Ravens coach John Harbaugh (left), general manager Ozzie Newsome and director of scouting Eric DeCosta (right) pose with Flacco.

Ravens quarterback Steve McNair, center, announces his retirement after a 13-year NFL career. Coach John Harbaugh, left, and Ravens general manager Ozzie Newsome were also present.

Ravens coach John Harbaugh chats with his brother, 49ers coach Jim Harbaugh, and their parents Jack and Jackie.

Jack Harbaugh talks with reporters after his son John was introduced as the Ravens' coach.

Jim Harbaugh drops back to pass during training camp.

Ravens quarterback Jim Harbaugh listens to center Jeff Mitchell between plays during an exhibition game with the Chicago Bears.

John Harbaugh greets fans after the Ravens' 30-7 win over the Chiefs.

Ravens coach John Harbaugh speaks to the media before practice.

Jim Harbaugh poses with 49ers general manager Trent Baalke during Harbaugh's introductory news conference in San Francisco.

Jack Harbaugh, father of John and Jim Harbaugh, stand on the sideline during the Ravens' win over the Oakland Raiders.

Ravens coach John Harbaugh watches his team score a fourth-quarter touchdown to take a 24-17 lead.

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 Ravens.

John Harbaugh reflects on the Ravens' loss to the Steelers. Harbaugh called it the toughest loss of his time with the Ravens.

Ravens coach John Harbaugh hugs 49ers coach Jim Harbaugh, his younger brother, after Baltimore beat San Francisco.

49ers coach Jim Harbaugh talks with Arizona players after San Francisco's win over the Cardinals.

Jim Harbaugh is introducted as Stanford's coach.

49ers coach Jim Harbaugh has a post-game altercation with Lions coach Jim Schwartz.

Jim Harbaugh scrambles against the Jets in an exhibition game.

Ravens quarterback Jim Harbaugh, bottom, is tackled by Indianapolis Colts defensive end Van Tuinei after rushing for a first down in the fourth quarter.

Ravens coach John Harbaugh greets his little brother, 49ers coach Jim Harbaugh, after the game.

Ravens coach John Harbaugh chats with his brother, 49ers coach Jim Harbaugh, and parents Jackie and Jack.

Ravens coach John Harbaugh gets a frozen cherry/mango slush from an ice cream truck on the field at practice.

Jim Harbaugh (right) had a brief stop in Baltimore during his fine NFL career, splitting time under center with the immortal Eric Zeier in the 1998 season. A decade later, his older brother John -- one year his senior -- was hired as the third coach in Ravens history. They will become the first brothers in NFL history to oppose each other as head coaches when the Ravens host Jim Harbaugh and the 49ers on Thanksgiving Day.

Ravens coach John Harbaugh congratulates Ray Rice on his second-quarter touchdown.

From left, Ravens coach John Harbaugh greets his brother, 49ers coach Jim Harbaugh. Their parents, Jack and Jackie, are also pictured.

Jim Harbaugh is introduced before the Ravens' preseason opener against the Chicago Bears.

Priest Holmes and Jim Harbaugh celebrate after Holmes' touchdown reception in the fourth quarter against the Colts.

Jim Harbaugh scrambles for a first down against the Eagles.

Ravens quarterback Jim Harbaugh tries out a photographer's lens following as Eric Zeier, left and Earnest Byner, right, look on during minicamp.

Stanford coach Jim Harbaugh calls out a play against Cal.

Ravens quarterback Jim Harbaugh reacts after the offensive line broke down, causing him to scramble against the Green Bay Packers.

Stanford coach Jim Harbaugh hugs his father, Jack Harbaugh, after the Cardinal beat USC 37-35.

Philadelphia Eagles defensive backs coach John Harbaugh interviewed for the Ravens' head coaching job on Jan. 8.

Ravens quarterback Jim Harbaugh scrambles upfield, looking for a receiver in the first quarter against the Chicago Bears.

Ravens quarterback Jim Harbaugh, right, gives the game ball to former Baltimore Colts quarterback Johnny Unitas, center, after the Ravens' 38-31 victory over the Colts. It was the first meeting between the two teams in Baltimore.