Is OTHER wrong in the post ? POST : So due to bad financial planning (aka neither of them getting a job), my older sister and her husband are moving back in with our parents, which also include our two younger siblings. 

It originally wasn’t a big problem when they were talking about it, but now that it’s actually happening, it’s a different story. 
They’re both very entitled people who don’t mind complaining the moment they don’t like something. 
This includes: someone’s music is “too loud”, someone is in the bathroom when they need to go (mind you, this is one bathroom for 5 people. Second bathroom is in parents room and rarely used), slow internet connection, and even complaining that they need to get rid of certain food because husband is on a diet. 

The icing on all of this boils down to a few things though. 1.) demanding my younger brother move out of his room because they need the bigger room. Even though my old room is completely empty since I’ve moved out. 
2.) they’re already pulling “we pay rent therefore we can do whatever we want.” Which has pissed my parents off considering they’re doing them a huge favor for letting them move in (rent is 100$ btw) 3.) making snide comments about “if you don’t turn into your dad, I promise I won’t act like *that*” in terms of how my parents act. 

I’ve mentioned it to them that they’re being dickish about all of this, but they’re under the impression that it’s what parents are suppose to do for their kids, so it doesn’t matter. 
Now I get my family can be annoying sometimes, we’re not perfect at all, but AITA for thinking they should be a bit more respectful? Or at least grateful they have a place to stay?

Or is it because now they’re living there, they do have a say in things?