Nightly News | January 30, 2013
>>> it's a dilemma that millions of parents face as they watch their children grow up. sometimes siblings end up on rival teams, playing against each other. well, this sunday, we may have what you could call the super bowl of all sibling rivalries. the story from nbc's stephanie gosk.
>> reporter: imagine your son playing in the super bowl .
>> this fires me up.
>> reporter: now imagine both of your sons.
>> our guys are excited for football.
>> reporter: playing each other in the super bowl . this sunday, coaches jim and john harbaugh face off on the field. in the stands, their parents, jack and jackie harbaugh , will be sweating it out.
>> that thrill of victory and the agony of defeat. and on sunday night, we're going to experience both of those -- those great emotions. and our thoughts will be with the one that comes up a little short.
>> reporter: but they are also reveling in the thrill. jack harbaugh was a high school and college football coach himself.
>> who has it better than us? nobody!
>> reporter: they won't be wearing any team colors, and they won't say where they are sitting. their sons have coached against each other before, just not in the super bowl . last season, on thanksgiving day . the ravens won.
>> during the three hours and fifteen minutes , i want you to know, this lady was comatose.
>> because of the stress. something all parents of star athletes go through. this summer in london, ally went for gold but it was her parents' anxiety routine that went viral.
>> stick it!
>> reporter: adding to the stress, the harbaugh parents were the victims of a prank. an unidentified caller offend into a live press conference last week.
>> caller: yeah, a question from baltimore. is it true that both of you like jim better than john?
>> is that january harbaugh ?
>> reporter: it was john. their son, teasing them. as if he and his brother hadn't already made things difficult enough.
>> both of them have shared this with us. mom and dad , please promise us that you will enjoy this.
>> reporter: programs perhaps the only fans in the stands monday who won't be playing favorites . stephanie gosk, nbc news, new york.