Whoever negligently commits the crime mentioned in the preceding paragraph shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years; If the circumstances are minor, they shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention.
According to what you said and relevant laws and regulations, your father may be suspected of arson or arson. The public security organ has the right to file a case for such criminal acts according to the actual situation, and then detain the criminal suspect according to law.