I'm on mobile so sorry for format. Tldr: Last 2 paragraphs are my current situation. There's probably not much advice to be given here I'm just ranting.

This shit started back in February when my uncle started dating this girl with two kids. My cousin whose 20 unsurprisingly started acting like a child about. Finding everything wrong about her and things like that. She basically acted like a total bitch when she was around then complained that his new girlfriend never talks to her and is making her feel 'excluded'. She let slip to me once that he's spending a lot of money on her and she's worried he won't be able to pay for her college.

My uncle caught on to this and chewed her out and told her to knock it off. After she continued to pull this crap over the course of the next few months my uncle began progressively punishing her. It started with 'screaming at her' then moved on to making her take more responsibilities. Not much you can do in my opinion she's 20 years old acting like a 5 year old. After a lecture she would come crying to my family looking for sympathy. I saw right through her but everybody else in my family felt bad for her.

This is where shit hit the fan. My uncle proposed to his girlfriend which as expected didn't sit to well with my cousin. She realized this woman she hates so much for her own selfish reasons is staying for good. I've met her and she's surprisingly nice and I'm happy for my uncle. My cousin however was not happy for him and didn't even congratulate him.

After that all it took was one lecture from my uncle and phone call to my mother and she's staying with us for 'awhile.' Which quickly turned into 'I'm moving in.' Now she's sleeping in my room in the basement, the smallest room in the house, on the floor right next to my bad. I'm 19 btw. She's moved all of her books onto my desk and brought her entire closet it seems and taken up my entire closet space. Never even asked if it was ok. My room is the only finished part of the basement. We've working on it for the past year to try and create space for our small house. But now the rest of the space is going to be used for my little brother so that my cousin can move into his room.

All this shit is fucking ridiculous to me. She should be back at her house where her dad built her a room 10x nicer than my room in their basement not 2 months ago but she doesn't want to go back because 'he's mean to me.' Instead she's taking up my space and my families time and energy. We've been working on this basement for over a year. Now she's comes in and changes everything. She accused my dad of not working fast to me behind his back last week. I'm so fucking sick of it. Shes ungrateful and only cares about herself. She's been constantly guilting everybody since she got her and I'm the only one who sees it. She even tried to make me look bad in front of my family by accusing me of being rude to her lately. Meanwhile she's takes over my room, keeps her fucking piss bottle in our fridge, takes over my bathroom, and comes into my room at 1 in the morning every night after seeing her boyfriend.

I don't know what to fucking do.