My sister is trifling and I don’t know what to do?

Anonymous
I have a sister who is a little over a year younger than me. She’s 19. She’s came home from college and is supposed to be getting her own car soon. She was in a bad accident so she’s using that money to get her own car within the next few weeks

We usually share a car and we’ve been sharing it for a couple of years. I got my license later than she did so she’s used it before I did. The car is in my dads name and she’s always had a job but before I started using it my parents paid everything on it like the oil change and stuff like that which is ridiculous.

I feel that my mom always takes her side and when I asked her why she did that she said she paid her the money back which I doubt. I don’t mind paying for stuff on the car by myself because I have two jobs.

I’m also in college and I go to one closer to home and drive the car while my sister was away in school so of course I paid for gas and all of that. However when she came home she would use the car up so I would still make her pay almost half and sometimes she wouldn’t or would “forget”. Once in a while she would.

Now she’s home for the summer and she’s been driving the car just as much as me. I’ve had to pay for the cars oil change, filter change, inspection, paperwork, and gas all by myself and she dosen’t pay anything but still continues to drive it. The only reason why I somewhat allow it is because she’s supposed to be getting a car soon.

She has the nerve to complain about how much of a mess this car is and how she hates it and dosen’t pay a single penny. The last time I filled it up with gas I asked her to pay half and she said her cash app was broken and acting weird. It’s been a week and still haven’t gotten the money and I’m fed up.
I’m tired of her using the car and not paying a penny and making up excuses and my mom either dosen’t wanna get involved or take her side. What do I do?
My sister is trifling and I don’t know what to do?
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