The theory of divorcing from ones family seems easy.....in reality it is not. Since you are no way required to have a relationship with siblings and are not required to allow them to inherited from you the courts often dismiss these petitions. The will cost you far more then it is worth in the end. Most judges dismiss these cases before they are even heard and term them as frivolous based on the fact that you can choose to not have contact with them.
In your situation, all you need to do is cease contact. Let them know to not contact you any longer and if they continue you can get a no contact order from the police or local courts. You will want to make sure that you add a stipulation in your will disinheriting them and why to prevent any issues with them trying to contest the will.
I wish you the best,
DISCLAIMER: Answers from Experts on JustAnswer are not substitutes for the advice of an attorney. JustAnswer is a public forum and questions and responses are not private or confidential or protected by the attorney-client privilege. The Expert above is not your attorney, and the response above is not legal advice. You should not read this response to propose specific action or address specific circumstances, but only to give you a sense of general principles of law that might affect the situation you describe. Application of these general principles to particular circumstances must be done by a lawyer who has spoken with you in confidence, learned all relevant information, and explored various options. Before acting on these general principles, you should hire a lawyer licensed to practice law in the jurisdiction to which your question pertains.
The responses above are from individual Experts, not JustAnswer. The site and services are provided “as is”. To view the verified credential of an Expert, click on the “Verified” symbol in the Expert’s profile. This site is not for emergency questions which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service (last updated February 8, 2012).