The Disenchantment
El desencanto (original)
This film is a documentary about the poet Leopoldo Panero. His widow and his sons talk about death in general in this special case, and also about their own family problems.
Watch "The Disenchantment" on FlixOlè released in 1976. It's a biography and documentary movie, and has a rating of 7.9 out of 10 from Imdb which is usually fine for this kind of movie.