CNN Sanjay Gupta MD January 19, 2014 12:45:00
>> reporter: that look was a reflection of grant's injuries. they were staggering. >> he had a torn aorta, brain bleeds, a broken wrist, a broken elbow, both femurs were fractured. >> reporter: his e.r. doctors told grant's family to let him go. >> the fact that the doctor wasn't fighting for his life just blew my mind. he's not dead yet. why would you just, as a parent, how could you ever let go not knowing that you haven't done every single possible thing that you could do for your son? >> reporter: doing every single possible thing was going to take grant's family on a wild journey. full of...