... for me it is To Kill a Mockingbird. It debuted in 1962 and was adapted from Harper Lee's Pulitzer Prize winning 1960 novel of the same name. Horton Foote adapted the material for the screenplay and Robert Mulligan performed the direction.
I am far from the character, but if there is a man and father I'd ever want for, or as a child, or would ever want to be, it is that of Atticus Finch. Happy Father's Day.