If your siblings are withholding access to family property documents and excluding you from your inheritance, you may have legal recourse. While you are entitled to a share of your father's property, especially if he died intestate, your mother's self-acquired property is hers to distribute as she wishes. It's crucial to act quickly, gather property documents (even certified copies from the registrar if necessary), and consult a local solicitor to file a partition suit for your father's estate.