Answer: The author of A fateful Journey uses historical fact from Moving to America in order to influence his story and its effect as a whole.
The author actively choses which historical facts will be used, which will be excluded bu if they need to be modified in order to make the reading more engaging or apealing to the reader. The result is what critics call historiographic metafiction.
Grandmother does not accept her son's guilt tactics. She knows when things are wrong and she voices her extreme disgust about the Nazi party to Bruno's father.