I think most people know by now that the film bears scant resemblance to the way the real life story unfolded, but the family was not terribly unhappy with the way it was portrayed. They wished the father had been shown differently, though:
Far from being the distant rather domineering father of the Sound of
Music, Johannes says he was "a very charming man, generous, open, and
not the martinet he was made out to be both in the stage play and in the
film. My mother did try to alter that portrayal for the film, but she
was not successful."