AITA for Refusing to Take My Sister In After She Got Divorced?

My sister Lisa showed up at my door two weeks ago with three garbage bags and a car full of her kids’ stuff. I didn’t even know she and Derek were splitting up. We hadn’t talked much since Christmas. Honestly, our relationship’s been… tense since our mom died.

She said Derek cheated on her, kicked her out, and that she just needed a place to crash “until she got back on her feet.” I asked what that meant, like how long exactly? And she got defensive. Said she didn’t need an interrogation, just some support.

Here’s the thing: I live in a small two-bedroom with my boyfriend and our cat. I’m also working two jobs right now and barely keeping it together most days. I didn’t feel like I could take in a full-grown woman, her two kids, and their dog with no timeline or plan.

Things Got Weird Fast

Lisa said I was her “only family left” and that Mom would be “rolling in her grave” if she knew I turned her away. That stung. Because when Mom got sick, I was the one who handled everything. Lisa was always “too busy with the kids” or “couldn’t get away.” I let that go at the time, but it still lives rent-free in my brain.

So I told her I could help her find a short-term rental, or she could stay a few nights alone on the couch while figuring something out. She lost it. Started crying, yelling that I was heartless, that her kids needed stability, and how could I be so selfish?

She ended up leaving and going to stay with a friend from church. I thought that was the end of it, but then she posted this long Facebook status about how “some people only love you when it’s convenient” and “blood means nothing these days.” Our aunt commented, “Shameful,” and I know it was about me.

Part of me gets it. She’s scared, overwhelmed, hurt. But another part of me is just… tired. Tired of being the reliable one. Tired of being guilt-tripped. I don’t have the emotional bandwidth or physical space to take this on.

I keep replaying what Mom said to me once: “Being kind doesn’t mean being a doormat.”

But then I think about my niece and nephew. I remember taking them to the zoo when they were little. They used to call me their “cool auntie.” Now they probably think I’m some kind of villain.

So… AITA?