The documentary, which will be released in cinemas on 1 November, received its UK premiere at the London Film Festival on Monday.
Alexandra Reeve Givens noted: “This year is the 20th anniversary of our dad passing away, and while that wasn’t an intentional way to mark the anniversary, it just felt like the right time where we’re comfortable enough to feel ready to share this story.
“And also there’s a whole generation of people who want to know in more depth about his life.”
The film features home videos that the family shared with the documentary’s directors, Ian Bonhôte and Peter Ettedgui.
“Reliving those experiences was incredibly powerful,” Alexandra said.
“[The film] tells the story of our dad of course, [with] amazing Superman footage from the early years in there, but also they’ve made it this much bigger story about what it is to be a family and stick together through thick and thin.”
