I (15f) was going roller skating with my mom (36f) and my little sister (4f) but before we went roller skating we stopped at a fast food place where I was told to sit down with my sister. My little sister doesn’t listen to me like at all and everyone knows it. Anyways I told my little sister multiple times to please sit down and she just wasn’t listening to me, so atp I was just tired of telling her to sit down. I pulled out my phone and started reading a book and my sister continued being loud and getting up. When my mom was finished ordering she came over and asked why I wasn’t watching my little sister, I told her because I’ve told her(my little sister) over 10 times to sit and she wasn’t so I gave up. My mom cancelled the roller skating trip and said I was being entitled because and that I need to help out with her. When I do try and correct my little sister she goes on and on about how I’m not her mother and I can’t tell her what to do. I feel like I do almost everything for my little sister I wake her up, brush her teeth, make sure she gets her vitamins, makes sure she eats breakfast. I told my older sister (17f) what she said and she told me to try and ignore it because she says things like that to get under my skin. This is not the first time my mom has done something like this and I don’t know what to do anymore. Aita?