Legal analysis: parents' handwritten wills, that is, their own wills, are valid if they are written and signed by the testator, indicating the year, month and day. The requirements of this book for wills are:

1, the testator must write the contents of the will and sign it; 2. The testator must personally write the full text of the will with a pen; 3, must indicate the year, month and day, all three are indispensable. However, if a will harms the public interest or its contents violate social morality, it is invalid.

Legal basis: Article 134 of the Civil Law of People's Republic of China (PRC), a self-written will is written and signed by the testator, indicating the year, month and day.