not another sister

13 years ago my father got a phone call saying he may be this 13 year old girls father. Then he gets a lettter from this girl after months of spending time getting to know her saying that she found her real father and it is not him. Yesterday I get a message from her on myspace saying that she think he is her father and she wants to talk to him to figure out if it is for real or not. It has been 13 years since the last time i have ever heard anything about her and now she pops up out of no where. I am not use to the idea of having another sister i already have two. I do feel bad for her i do not know what it must be like to not know who you father is. But i have a feeling that she is my sister she does look a little like me after all.