1. If grandpa only has a criminal record, but he has not been sentenced, his grandson can enter the military school.
2. Only lineal blood relatives and collateral blood relatives who have a great influence on me are sentenced to death or are serving sentences or engaged in activities to subvert the China regime at home and abroad, and cannot apply for military schools.
The above information is for reference only and cannot replace professional legal advice. It is best to consult a professional lawyer to ensure that the information obtained is accurate.