Your best bet is to talk it over with your parents and your sister to see if you can come to an agreement.  Legally, you can get a lawyer and pursue the status of an emancipated minor, but that takes money and time.  Odds are at 17 you haven't got the money, and by the time it was over you'd be 18 and free anyway.  \n\nNow, if there is actual abuse going on, get in touch with a local child abuse advocacy group or file a complaint with local law enforcement.
Im 17 and how do i go about living with my 20 yr old sis and her husband instead of my parents?