How does the small confinement affect individual personal behavior?

Certrainly made people have a sort of cabin fever.this close proximity brought the best and the worst out of people.

Take for example Margot Frank, Anne's sister. She is three years older than Anne. She writes in one entry that Margot gets on her nerves constantly. But later in their stay in the annex, they reach an understanding and become more friendly, even writing letters to each other in which they reveal their feelings.