I (44M) was at my mom’s house working on my car. Midway through, I needed to run to AutoZone for a part. I asked my sister (48F) if I could borrow her car, and she said yes.

On the way back, someone pulled out in front of me and we got into a wreck. Her car was totaled. I hired an attorney, and the other driver was found 100% at fault.

My sister originally bought the car for $10K several years ago. The other driver’s insurance paid her $9.5K for it, and I made sure she was also reimbursed for her rental. I even helped her search for a replacement and found multiple similar cars—some identical to hers—for around $7K.

Instead, she decided to upgrade and bought a newer model for $20K.

Now, there’s a chance I might get a small settlement from the accident. Maybe a few thousand, maybe $10K—nothing guaranteed yet. But my sister is demanding that I split it with her because she “had” to buy a new $20K car and is out the extra $10K.

I told her no.

Since then, she’s been complaining to our mom and her friends, saying I’m “stealing” from her.

The thing is, I would have shared some of it if she hadn’t come at me with this entitled attitude. I handled everything, got her paid, and tried to help her find a new car, and now she’s acting like I owe her something.

At this point, I’m thinking I’ll just use part of the money (if I get any) to help my mom pay for a new AC system, which she needs, at the house. (both my sisters live with my mom rent free).

So… AITAH?