The document defines several common terms used in will disputes: contested probate refers to challenging a will or estate-related claims, a caveat temporarily stops probate from being granted, a will could be invalid if it lacks proper execution or the testator's knowledge and approval of the contents. Undue influence and lack of testamentary capacity are also grounds for challenging a will. The Inheritance Act allows certain eligible people not sufficiently provided for in a will to apply for reasonable provision.