Alright well I am recently engaged to the best man I could ever ask for. Well, I have a younger step-sister. She has been like a best friend to me for a while, but she does keep screwing me over. I ignored the stuff that she did and I went on being her friend. Well, my bestfriend called me up the other day and said that my step-sister had told her that my fiance was asking her who she wanted to have sex with and then when she finally answered him, he started to talk about sex every time they got to talk. I know that is bullshit cause for the last 4 days I have been on the phone with him til about 11 at night and she said that this is happening at night when he gets on the net. I went and asked him about it anyway and he said that the conversation never happened , that he went to be after talking to me every single night. I decided to three way her on the phone and I made my fiance be quiet and she started to describe what he was doing and he bluntly said to her that she was a liar. After that she said that he didn't do anything and she has been changing her story ALOT. When I asked her if she was just saying that she wanted to sleep with my fiance , she didn't say anything. When I asked her if she was planning to try to sleep with my fiance, she said that nothing would happen as long as Tim and I were together. Tim said to her that it would never happen anyway. I yelled at her and she hung up, but she called back later trying to explain herself with a different story of what happened and she is telling everyone that she isn't lying , that it is Tim lying and I have no right to be pissed off. This chick told me she wanted to fuck my fiance , lied about it to my bestfriend and is spreading rumors about me and Tim. I am pretty sure I want to beat the shit outta her , but I can't because I'm related or I wouldn't of thought twice about it. What do I do about this stupid bitch ?