I (22F) recently graduated and still live at home while I save to move out. I work full time, pay rent to my parents, cover all my own expenses, and help around the house.

My older sister (30F) has a 4-year-old son. For the past year, I've been watching him a couple evenings a week while she works or goes out. Unpaid - just "helping family". It's exhausting, especially after long workdays, but I've done it because I love my nephew.

Last week, during a family dinner, I mentioned I might not be available every week going forward because I've picked up extra shifts to save faster for my apartment. My sister said,"Well, it's not like you have real responsibilities yet".

I just... blinked. I asked what she meant, and she said something like,"You don't have kids, a mortgage, or a husband - you're still basically a teenager".

I didn't argue, but the next day I told her I won't be babysitting anymore. I said I'm happy to hang out with my nephew on my own terms, but I'm not going to keep rearranging my life when she clearly doesn't respect mine.

Now she's pissed, saying I'm punishing her son over a comment and being dramatic

AITAH?