They're the "witches" in the book A Wrinkle in Time. It might be more appropriate to ask WHAT they are; at one point in the story it's implied that they are the "ghosts" of stars.
It is easy! Mrs is a woman who is married!Mr is a man or boy or whatever and miss is a female who is not married! xxHope it helps.... xxx bibi xx:
Mr and Mrs its just more formal today in society.
Mrs Tonks (Andromeda) did not die.