Brown Ant
Hunter-Gatherer
This happened to me too. My folks threatened to call the cops on me and just generally hated me living at home (even though I was trying to move out and handle my business)...but would let my older sister live at home, eat food and get fat all day, and not have a job in years.
Let me guess, your sister was their first born? Parents play favorites with their children, it's disgusting but a weakness they cannot overcome.