answer: #Person2# has a step-brother, a step-dad, and #Person2#'s mom. #Person2#'s mom and #Person2#'s step-father met after #Person2#'s father died and got married later. #Person1# has a big family including an identical sister who looks the same as #Person1# but is different from #Person1# in every aspect.
documents: #Person1#: How many people are there in your family?
  #Person2#: My immediate family is quite small. It's just my older step-brother, my mom, my step-dad and me. how about you?
  #Person1#: I have a large family. I have three older sisters, my twin sister, a younger brother, and parents.
  #Person2#: I didn't know you were a twin! Are you identical or fraternal?
  #Person1#: We're identical. I mean, we look exactly the same, but we are complete opposites when it comes to everything else.
  #Person2#: Interesting. It must be great having a twin sister. Are you best friends, too?
  #Person1#: We used to be really close, but that all changed once she moved to Shanghai. How about your family? You didn't mention to your biological father.
  #Person2#: I don't know much about him. He died when I was just a baby. Even though I don't have a blood relationship with my step-father and step-brother, I consider them to be my real family.
  #Person1#: What about your step-brother's mother? Does he keep in touch with her?
  #Person2#: No, she also died when my step-brother was little. My mother and my step-father met each other shortly after my father died and became good friends. They ended up getting married a few years later.
  #Person1#: Sounds like it was meant to be.