OK so this is irritating to me. me and my fiancé live with his parents and look title sister (she's…

OK so this is irritating to me. me and my fiancé live with his parents and look title sister (she's 17) well his little sister walks around the house not caring that her bra and boobs are literally hanging out of her shirt. even when the windows and door is wide open. another thing that makes me upset is that when she is asked to do something she wants to be paid for it. he dad will ask for her to get him something or to do something she demands money