<human>: I went away to university and moved out of my parents house a few years ago, but I've always come back to live at my parents house and work in their city. The year before I left (at seventeen) we renovated the basement and my parents built me a room downstairs and a little living room area. My sister still lived upstairs (second floor). In this last year (sept2012-april13) she's been living in my downstairs room. I originally was against this agreement because I come home to visit every couple of weeks but we agreed that she could live there until I finished my last exam in April.  When I got back I was naturally surprised that she hadn't moved out yet, considering I warned them that I would be here two days late in fact.

Now gets to the fun part. My parents tell me to wait and that no matter what I will get my room back. I go to hang out with my buddy that evening and she messages me a long letter detailing the reasons why she should keep that room. 1)moving stuff upstairs would be a lot of work 2)she has a boyfriend and needs privacy 3) she needs to 'focus on school' and can't focus upstairs where our parents are. I message her back saying that she should have planned for this and it's not negotiable. She FLIPPED out at me and all sorts of stuff. 

My parents then called us to have a 'meeting' about this. She starts being emotional and cries and says that if she can't get the room downstairs to herself, she's going to move out, and my parents have to pay her rent. I'm so certain that this is a bluff, but my parents are worried. They've offered all sorts of unreasonable options like they live in the main floor so my sister can live upstairs, or building another room for my sister in the basement, but she won't have any of that, and I don't particularly want that.  There's a bit more detail if anyone wants it; I just want to know how to deal with an impossibly stubborn sibling.

Can you give me a shortened version of the text?
<bot>: I left for school and I made an agreement with my sister for her to live in my (awesome) room until I came back from school. Now she's reneging on that.