<human>: Give me the gist of the text in a nutshell

I am a college student working part time right now but I do still live at home. I am not home horribly often however because of work, school, and actually seeing my friends. I am trying to save up a good stash of money right now so I just move out. However my parents [40s] have gotten very particular about me not spending time at home anymore. They also expect phone calls whenever I am not. Which yes I understand but sometimes with my age it feels really silly. Recently however they have wanted me home because of my little sister. They never want her alone. When they both work they always expect me to stay at home. If she were younger I would understand but she is 15 and a half years old. They left me home alone all the time when I was even younger. I get texts and phone calls when they leave that are my parents reminding me to cook and sit and make sure my sister eats. She and I both think it is kinda over the stop since she can just drive herself places soon but my parents think I have to be there. Am I wrong in thinking that both my sister and I are too old for this?
<bot>: My parents want me as a 20 year old to constantly monitor my 15 and half year old sister who is fully mentally functional and self sufficent. I don't think I should have to.