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Mainly depends on the degree of injury, if it constitutes a minor injury or more, it is a criminal case; If it does not reach minor injuries, it is a public security case. According to your introduction, your mother was hit on her forehead with a nail and an iron bar, and a wound about 4 cm deep on her bone was smashed. This situation should be evaluated as more than minor injuries (ultimately subject to the injury identification of the public security organs).

If your mother is slightly injured (or above), then A's behavior is suspected of intentional injury. Those who are slightly injured shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance; Those who constitute serious injuries shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years. In addition to criminal liability, Party A shall also bear civil liability for compensation for your mother.

In addition, if the injury suffered by Party A does not meet the standard of minor injury, you will not bear criminal responsibility, but will bear civil liability for the injury suffered by Party A at most. ..