Feeling low

Hello. I don’t post often, only when I feel I need to tell someone how I’m feeling. I live with my sister and her bf and we all pay rent. Their relationship has been rocky most of the time. Anyways. They both lost their jobs around the same time in September. They haven’t found a job since then or aleast to my knowledge. They were doordashing. They were doing more frequent in the beginning but they slowly started to pick and choose what they would do. My job isn’t enough to be paying for everything myself. I fear we may be getting kicked out soon. They lost interest in doing anything. So my sister told me that they going to be going somewhere so I have to find somewhere to go. I feel like she blames me for losing her own job. Her boss showed up at our house for a wellness check cause she no call no show or callout idk, and I had to go to work but they weren’t planning on answering the door. I told them to talk to her or she will get the police involved and they said they would so I left to work. Then later she texts me, “Why did you tell her I was home, she fired me. I called out to take my daughter to the doctors.” Like what does that have to do with me?! If you really told her that, why would she fire you?? But the problem is I have done nothing but helped. I practically raised her child till around 4 or 5. Moved to a different place to still watch her child, took out a loan for the place we’re staying at now, I have her car on my insurance. I did too much. Much more than she deserves. Now she’s tossing me aside in unfamiliar place. I will be going back home where the rest of my family is but I want to stay to support my coworkers through Christmas and save some money. I may live in my car but coworker seems like she wants to help so I’m thinking about giving her my pc for her sons. I just feel wronged, betrayed, disrespected by my own sister. So when I leave this place, I’m leaving with one less sister. I hold grudges including if they do something like this.