Steph Curry’s Unanimous Media will produce a family film for Netflix, “Black Brother, Black Brother,” that’s set in the world of fencing.The film is based on a book by Jewell Parker Rhodes, which landed in Curry’s Underrated Book Club and marks the author’s second book to be optioned into a film. Curry and Erick Peyton will produce “Black Brother, Black Brother” on behalf of Unanimous Media.