Changing the locks on our doors today. My brother-in-law won't stop coming in in the middle of the…

Changing the locks on our doors today. My brother-in-law won't stop coming in in the middle of the night smelling like weed and making my entire house smell like weed. I'm DONE. This kid has had everything handed to him. Not anymore. We have our own child to start thinking of now. So pissed and stressed out... He didn't even ask if he could move back in. I just go in the spare bedroom for an extra blanket and find ALL of his clothes there! Little disrespectful brat. He's 19 by the way.. But asks like a 2 year old. UGH, I DON'T NEED THIS STRESS.