Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: My sister(23f) and her fiance(22m) are going to be in my city for a wedding in a couple weeks and asked if they could stay the night with me to save costs. I actually have a wedding to go to that same weekend, but in a different state. I told her that it should be fine to stay in my room while I'm gone, but I'll double-check with my roommate L. 

L and I have been roommates for a few months and everything has been pretty good so far, save for a couple obstacles: I talked to her about getting a cat before I signed a lease and she said she was down for it...a couple months later, the opportunity arises to rescue a kitten and she vetoes the idea based off the fact I'm out of town 1-3 days a month. Fair enough, I understand her concern, even though my boyfriend said he would be willing to come by while I was gone so she didn't have to care for it. Speaking of boyfriends, she doesn't really allow him in our apartment. We don't do overnights(personal beliefs), but she doesn't like him to hang out at our place so we usually go to his. It's become increasingly frustrating, but whatever. Other than that and the fact that I feel like she isn't the best at picking up after herself, it's really not so bad. We're still friendly and I generally like her. 

Now, I ask L about having my sis and her fiance stay there. They'd get there late Friday night, have the wedding most of the day Saturday, stay the night again, and leave early Sunday morning. She says she's not comfortable with him staying overnight. While I want to respect her wishes, I also feel like it's kind of ridiculous because that's MY apartment too. The bedrooms have locks, they'll be there for maybe 16 hours total(all sleeping hours), and she can always stay at her mom's place which is 3 miles down the road. 

So Reddit WIBTA if I tell my roommate that I'm allowing my sis and her SO to stay anyways? 

letting my sister and her fiance to stay overnight in my apartment while I'm gone