After the death of Lao Li, his children quarreled about the division of the estate. At this time, the eldest son took out a written will signed and stamped by his father, and advocated to distribute the old man's property to himself according to the content of the will. Other children believed that the father was suffering from senile dementia and mental disorder, and the court had declared the father as a person with limited civil capacity upon application, so they did not agree with the validity of this will. Is this will valid? It is invalid to argue by case. Article 1143 of the Civil Code stipulates that a will made by a person without or with limited capacity for civil conduct shall be null and void. A will must express the true will of the testator, and a will made under fraud or coercion shall be invalid. A forged will is invalid. If a will is tampered with, the tampered contents shall be invalid. (Liu Xinshe)