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.

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.

Whoopi Goldberg reflected on her friendships with Robin Williams and Christopher Reeve in a conversation with Reeve's adult children, Matthew, Alexandra and William, during the Thursday, Sept. 19 episode of "The View.

Directed by Peter Ettedgui and Ian Bonhôte, “Super/Man: The Christopher Reeve Story” premiered at Sundance and is slated to get a wider release in San Francisco starting Sept. 21. Theaters should be handing out tissues at the door, as there’s nearly a 100% chance that audiences will be brought to tears.

Very few actors embodied the role of a superhero quite like Christopher Reeve. For generations of movie-loving audience members, Reeve was – and is – Superman. He first stepped into the iconic DC role in 1978’s aptly titled Superman,

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.

"The View" host said that she was "lucky enough" to know both of the late actors in her lifetime. Whoopi Goldberg is looking back at her friendships with the late Christopher Reeve and Robin Williams.

Alexandra, Matthew and Will Reeves were also joined DC heads James Gunn and Peter Safran Jamie McCarthy/Getty (left to right) Matthew Reeve, Alexandra Reeve Givens, David Corenswet and Will Reeve Christopher Reeve's children are in New York honoring their father,