My sister is leaving her son with my family, now I'm having to get up in 7 hours to go get rental…

My sister is leaving her son with my family, now I'm having to get up in 7 hours to go get rental car because the gas station managed to get gas in the tank and ruin mine, so now my family has no vehicle, and my mk. comes home tomorrow. So now I'm staying at my mom's to help out what was suppose to be a night, is now a week, and I need to unpack since we left on vacation before we had a chance when we moved in because I'm having company in 2 weeks. She claims she's stressed and can't take care of him, but I've been taking care of my mother and grandparents, my family, and now I'm forced to stay here, because she can be a parent. She'll probably go party and have a date night (s), and I'm having to buy him formula and diapers. She claiming stress, but she has done nothing, and has had nothing to with out family except for money since my mom's accident almost 5 months ago. But apparently I can't be stressed, and I have no issues or reason to be stressed, regardless of taking care of my family and dropping everything the past few months, and dealing with my mother's affairs and helping my grandparents and my family with no help, nope I don't need a break that I've waited for and earned. I'm beyond mad and hurt. I've had a stress migraine for over a week, but I just get more added on top...