1st or 2nd? 2 or 3? Doesn't really matter to her, i guess

So, it's years ago like 4 or 5 years ago. A cousin of mine stay in my house. I thought it's not gonna be long but in fact it is. She moved school and her mother got cancer so my dad's aunt sort of force us to let her stay. My mom is too kind that she accepted it. I didn't get along with her (my cousin) too much. we hadn't spend a lot of time together like other cousins should have. We fight sometimes. Those are the beginning but as time goes on i try too accept her in MY family. She even joined us in our family Pict. and mom got it printed BIG and she put it in our living room so when anyone come to my house they can she HER with MY family and they questioned who the hell she is. As far as anyone know i am the FIRST child in MY family and in a sudden my mom said to EVERYONE she met that I'm her SECOND child. Hell not! What would people think?? I'm an adopted child? or SHE is? or may be my brother is? I keep on saying I'm the first child and she keep on saying I'm her second. SURE. So whatever ups and downs sometimes i do like her sometimes not at all. and she's such a good pretender and i think if she'll win as the best pretender EVER. Now that she's not in my house anymore she still left some burden for me. So, now she's in Su Zhou, China. In whatever university (i forgot) and she got to send dozen of data to my father THROUGH me. So i got to check my email everyday in case she send something important. There's also one day early in the morning when my dad asked me to print some data from her when I'm in a hurry and because I'm not that evil to my OWN father so i help him out.