I don't like my older sister and the way she deal with things. She is doing something illegal and I afraid that I will have trouble in the future. We used to live in same apartment until our 20s and I move out of state. I like to "legally" file a legal document to state that she is not my sister anymore. I am not sure if this is called emancipate or "divorce"? Like how husband and wife legally separate? Can anyone point me to the right direction? If I am going to consult a lawyer, what word I should use? Is there such a thing that I can do or if this such things doesn't exist? I live in California and she lives in Midwest now. Only my father still alive now and both my sister and I are in our 40s. If you need more background information, I will provide.
Thank you in advance.

