My 18 year old sister currently lives with our father in Florida. Right now she is about to finish her junior year of highschool, which leaves her with 1 year left of school. My sister would like to move in with me & my husband in North Carolina because she doesnt have a healthy relationship with our father. However, she cant withdraw herself from school because she must have her parent/legal guardian to withdraw her even though she is 18 & legally considered an adult. Unfortunately my father doesnt want my sister to move, he wants her to live with him til she's in her mid twenties at the very least. I really dont want to go through the hassle of taking my father to court to get legal custody of her. My question is: Can I become my sister's legal guardian even though she is 18 & how to?