I hate how I can help my sister do anything she needs done pretty much at any time, but when I just…

I hate how I can help my sister do anything she needs done pretty much at any time, but when I just need her to sit in the car with my almost 2 week old son so I can run in a couple stores and not have to drag him in and out of the car every five minutes, she can't do it when she isn't even doing anything but sitting around😠 see how much I do for you now. On top of that, I'm getting bitched at constantly for stuff that isn't even my fault, all while waiting around for the person who is doing the bitching so I can take him to fix his car. I have a little more than an hour to get everything I need to do done before my sons doctors appointment.. I'm so freaking stressed out!😠😔