I’m a family friend, of the sons, but I also knew Paul. They started filming, before Paul’s illness presented. They went with him to Austria for Godel@100, and filmed that lecture, which is searchable on Youtube. The boys, although Stanford grads and good in math by most people’s standards, are in the arts, and are Hollywood SAG actors. I would say that they are still mourning Paul and that has prevented them from furthering the film, which starts with a discussion of the math per se but digresses, for instance, to footage of Paul being moved from one part of Stanford Hospital to another, after a surgery. A known filmmaker, and mutual friend Elizabeth Thompson, met with the sons to discuss the dynamics, how much family to intersperse with how much math. They corresponded with David Foster Wallace about whether he would narrate, and he declined.
Paul was quite a character, and enjoyed music and comedy — he did stand-up in clubs. They are in some ways like the Kaplanskys, whose daughter Lucy is a successful folk-singer. The Cohen estate donated their family piano to the math department, for the fourth floor, at Stanford.
I would think they would welcome correspondence, encouragement and suggestions, about this film. I sent them the link to Alec Wilkinson’s article in The New Yorker, about Prof. Zhang, and the film.
If you search my blog, there is more about the Cohens. (Plastic Alto, on wordpress)
The Cohens at this point are 7, a prime, not that it’s anyone’s business: