I am attending a community college right now to get my basics done. My step-sister is currently finishing up her senior year in high school and both of us are planning on attending the same 4 year university. My dad and step mom gave the two of us an idea on how we can save money during college. There is an off-campus apartment edition that is very cheap and has great features. The plan that they were introducing us to was a 2 bedroom 2 bathroom plan that was $700.00 a month and we could split the rent every month between the 4 of us. So I would get my own bedroom/bathroom and my sister would get her own bedroom/bathroom as well. We both thought that this would be a great idea. However, I just got to thinking about something. The Catholic Church teaches that it is a sin for unmarried boyfriend/girlfriend couple to live together (even if they don’t have sex) because it gives scandal or could give scandal. I was wondering if the same principle applied to a brother/sister who lived together for a few years. She is two years younger than me and I’ll probably will have graduated a year or two before she does so we’d only be sharing it for a while and during her final years in college, she would be having it to herself. I am Catholic but my dad, step mom and step sister are not. I thought that it would be okay since we’re not dating and since we’ll be in separate room and using separate bathrooms and since it would only be for a couple of years, it would be OK. Any thoughts?