Inheritance refers to the disposal of property left by people who are no longer alive. If your grandfather is still alive, there is no inheritance issue, as long as you have a will.

Article 1122 of the Civil Code: Inheritance is the legal personal property left behind when a natural person dies. Inheritance that cannot be inherited in accordance with the provisions of the law or due to its nature shall not be inherited.

"Interpretation of the Supreme People's Court on the Application of the Succession Section of the "People's Republic of China and Civil Code" (1)"

Article 27 A natural person's suicide note involves the death of a natural person If the content of the disposition of personal property is indeed the deceased's true intention, signed by the deceased and marked with the year, month, and day, and there is no evidence to the contrary, it may be treated as a self-written will.

Article 28 The testator must have full civil capacity when making a will. A will made by a person without capacity for civil conduct or with limited capacity for civil conduct will still be invalid even if he later acquires full capacity for civil conduct. If the testator had full capacity for civil conduct when making the will, but later becomes a person without capacity for civil conduct or a person with limited capacity for civil conduct, the validity of the will will not be affected.