Siblings often assume access to each other’s things, but that only works when everyone respects the boundaries.

After a young woman bought her own car, her sister took advantage of it without cleaning up or replacing the gas.

It didn’t take long before the frustration finally boiled over.

Read on for the full story.

AITA for telling my sister she couldnt use my car to take her kids to my nieces birthday party?

My family and I live together, and I finally decided to buy my own vehicle about a month ago. This way, I’m not constantly asking my mom or uncle to use theirs to go to drill or work.

But once she got the car, someone else in her family started feeling entitled to it.

The day I got it, my sister asked if she could use it whenever she had to take all four of her kids somewhere. I told her I didn’t mind, as long as she cleaned up after them and returned it with at least the same amount of gas she left with.

So far, every time she has used it, she hasn’t done either. She always guilt-trips me when I tell her she’s no longer allowed to use it.

Soon, the conflict reached a fever pitch.

Last night, we got into an argument because I told her that I might have to leave for work while we were there, and she threw a fit over it.

This morning, I asked her if she was paying for the entertainment for everyone at the party, and she said she was only paying for the kids.

Finally, she had to set a hard boundary with her sister.

I didn’t want to deal with the pushback, so I told our mom to tell her that if I wasn’t going to be compensated for the 70 miles of gas she was going to burn in my car — which I need for work — then she isn’t going to be allowed to use my car.

So now, I am not going to the party, and she is not using my car.

So AITA?

Protecting her property shouldn’t make her the villain.

What did Reddit think?

If her sister really needed the car that badly, the least she could do is be respectful to the person loaning it to her.

If her answer is “no,” then she needs to firmly stand by that.

Her sister’s behavior is just plain disrespectful.

This disrespect could have serious consequences later down the road.

Her sister really needs to get her entitlement in check before she damages this relationship any further.

Family or not, boundaries matter.

If you thought that was an interesting story, check this one out about a man who created a points system for his inheritance, and a family friend ends up getting almost all of it.