The will signed by the mother on behalf of the father is valid, and it is legally effective for parents to make a will to dispose of personal property in accordance with the provisions of the inheritance law. But one of the testators is still alive and the will has not yet taken effect. Article 2 of the Inheritance Law: Inheritance begins when the decedent dies. Article 16 A citizen may make a will to dispose of his personal property in accordance with the provisions of this Law, and may designate an executor. Citizens can make a will and hand over their personal property to one or several legal heirs for inheritance. Citizens can make a will to give personal property to people other than the state, the collective or the legal heir.