I'm thinking about kicking my cousin out of the house.
What drove you to this idea?
She is always complaining about everything.
While it is important to do your best to look after family members, it is also important not to enable them and coddle them. If your cousin is consistently bringing stress into your life then kicking them out may be the option that is best for you and them.
My cousin has a drug addiction and she's a spoiled brat. She's already ruined my life a lot, so I think it's time to kick her to the curb.
Yeah, if your cousin is an addict and isn't getting help, then having her in your home could be dangerous. It would be a good idea to set boundaries with her, letting her know what you're willing to do and what you're not willing to do for her, particularly while she's still addicted to drugs.