A reference to a sibling in a will generally includes a half-sibling. For clarity, wills should identify executors, trustees and beneficiaries using their full names rather than by their relation to the testator only. This can help avoid the need for an application to the Court upon the testator's death to determine the meaning of the will.
Where there is no will, the law draws no distinction between full and half-blood in the distribution of an intestate estate [Succession Act 2023 (SA) s 101(2)]. See Distribution of an intestate estate.