answer: #Person2# tells #Person1# why she always supports her brother.
documents: #Person1#: I cannot understand why she always helps and supports her brother.
  #Person2#: Why do you say so?
  #Person1#: Because he is often in trouble.
  #Person2#: She has promised her mother that she would be with him through thick and thin.
  #Person1#: Oh, I see.