For a will to be valid and binding in Australia, the testator (the person making the Will) must have testamentary capacity at the time the Will was created. Testamentary capacity occurs when the testator is of sound mind and must understand: The nature and effect of the Will; What encompasses the estate; The claims others might have upon their estate. To provide a practical example any individual with advanced dementia, amnesia or severe mental disability will unlikely have the requisite...