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.

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,

Christopher Reeve's children Alexandra, Matthew and Will were a united front at the New York premiere of the documentary honoring their late father. See all the red carpet photos

Christopher Reeve is the perfect Clark Kent / Superman, and no matter how hard any actor tries, no one will be able to bring to the character what Reeve brought to him. It was truly something special,

Super/Man: The Christopher Reeve Story, from the filmmakers of McQueen, finds the real man beneath the cape. It makes him stand even taller.

Super/Man: The Christopher Reeve Story does deeply moving and thoughtful work providing a tribute to a cinema legend