During the witness statements from the various family members in Rian Johnson's Knives Out, a enjoyable, modern, Agatha Christie style murder mystery, a private detective and the police quiz the family of a murdered (or suicidal) novelist about the events surrounding his death.
The murdered novelist's nurse, Marta, is an immigrant and her mother is unregistered and illegal. This is not widely known and is an important plot point later in the movie.
But, when the family are describing Marta, every member gives a different country of origin for her family. All agree she has come from a South American country, but no two people give the same country as her origin.
Is this significant in some way to the theme of the movie? And why don't they have a consistent view?