Legal analysis: 3-5 samples are needed for handwriting identification of wills. Handwriting appraisal generally needs to provide 3-5 samples to the appraisal institution. If the parties cannot provide inspection materials, they may explain to the judicial authentication institution the reasons why it is difficult to obtain the materials of the original trial of the case. Judicial authentication institutions may also send people to the scene to take photos or provide copies with signatures and seals of the source. Moreover, handwriting identification must apply to the criminal identification center of the public security organ. A will refers to a legal act of handling a person's estate or other affairs in a manner prescribed by law within the scope permitted by law before his death, and takes effect when the founder dies. The controversy is more prominent. The so-called will refers to the personal punishment of the testator's estate or other affairs in the way prescribed by law before his life, which takes effect when the testator dies.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 133 A natural person may make a will and dispose of his personal property in accordance with the provisions of this Law, and may designate an executor. A natural person may make a will to designate personal property to be inherited by one or more legal heirs. A natural person may make a will to donate personal property to an organization or individual other than the state, the collective or the legal heir. A natural person may establish a testamentary trust according to law.

Article 134 A self-made will shall be signed by the testator and marked with the year, month and day.

Article 135 A will written by an agent shall be witnessed by two or more witnesses, one of whom shall write on behalf of the testator, agent and other witnesses, and shall be signed by the testator, agent and other witnesses, indicating the year, month and day.

Article 137 If a will is made in the form of audio and video recording, two or more witnesses shall be present to witness it. The testator and the witness shall record their names or portraits, as well as the year, month and day by audio and video recording.

Article 138 A testator may make an oral will in an emergency. An oral will shall be witnessed by two or more witnesses. After the emergency is eliminated, if the testator can make a will in writing or in the form of audio and video recording, the oral will made is invalid.

Article 139 A notarized will shall be handled by the testator through a notarization institution.