So, my sister is visiting the homeland with her boyfriend (see my location)(she lives in another country, with her boyfriend in a sexual relationship) soon. The problem is that she wants to visit me (which is great) but firstly she is stupidly tight with money and wants to stay in my one bedroom flat and sleep in my kitchen/study/living area which is about 3 metres wide and 7 metres long and contains only my kitchen, study desk and an old 2 seater couch. There are cheap hotels in the area, and even backpackers, but she insists that she wants to stay in my house. I just find that ridiculous when there is no space. I also have to go to class the next day and wake up at 6 so I can't be dealing with people on my floor, or having to entertain people or listen to them or just in general worry about them.
But here's the bigger problem (and the one I came here for). What I object to most of all is that she lives with her boyfriend etc. So she assumes, obviously, that they will just make due and sleep together on the floor in my flat. Which I don't want. Even though I realize they won't be sexually active, this is besides the point. The only solution (which she might not like anyway) is for her to sleep on my bed and me and her boyfriend to share the floor... and look, not that I don't love her, but that isn't happening, not when it's totally unecessary and when I have classes the next day.
I guess I am asking if I am being reasonable and what I should say. She is trying to get back into her faith, and I have given her a lot of books to read, but again she is trapped in that "I can't live without my boyfriend" mindset (he is an atheist and an obstacle for her as he makes her question the faith a lot, nevermind the sexual relations and co-habitiation). I'm just not sure. As a younger brother I don't want to sound like I am being bossy or judgemental, but at the same time I live here and although my mama still pays rent as I am in university I don't want to look like I think its okay for her to sleep with her boyfriend etc.