Reeve's three children, Alexandra Reeve, Matthew Reeve, and Will Reeve, an ABC News correspondent, told "Good Morning America" on Wednesday at the premiere that the film is a tribute to their father's legacy and the lasting impact he had on who they are today.

Christopher Reeve's oldest son Matthew Reeve tells PEOPLE at the New York City premiere of the documentary 'Super/Man: The Christopher Reeve Story' that his mother Gae Exton "is incredibly brave to tell her side of the story" of their family's history in the new movie.

Armed with home videos and interviews with Reeve's family and closest friends, "Super/Man: The Christopher Reeve Story" gives a powerful and honest look at the man who played a hero, and then became one after a devastating horse-riding accident left him paralyzed nearly 30 years ago.