My mom just passed away n left behind a 13 yr girl.. my sister... who I would like to get custody of because ifell if I don't I will never be allowed to see her or have her over to my house father is alive but unfit
There's an aunt that has her as of right now but won't allow visits or overnights with me her sister what should I do

Where is this (state, province, country)?
How old are you? Are you financially secure with a suitable home, near the father and aunt?
Was custody awarded to the aunt by a court? If not, did your father just send her to your aunt's? Was he denied custody when your mother was alive?
Try to spell out the timeline of events.