I say take him. Obvoiusly the only people who know the story are your friend and your sister. Whatever decisions were made by either of them have nothing really to do with you. It's not like you're trying to hurt her or anything. I think that you are all adults, and being an adult means acting like one. You are, at some point in your life, going to be in situations with people which are less than optimal, but you have to be mature, act politely, and move on. I think you should explain everything to your sister-tell her that you are in no means trying to hurt her, etc. but that this is your friend, and you want to take him. Good luck sweetie.
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