Georgia child custody laws, can a older sibliing seek custody of younger sibling that is in an abusive home

custody case: Can i get custody of a younger sibling that is in an abusive home. I am 20 years old she is 15. I have a job and I am in college. I still live at home with myy father, my sister and I have different fathers and our mother passed. She is currently living with her father and he is abusive. - Is this your question? Add additional information