Legal analysis: Grandpa is in prison for two years, but grandson can't be a soldier. Male citizens who have reached the age of eighteen before December 31st each year shall be enlisted for active service. Those who have not been recruited in that year can still be recruited for active service before the age of 22, and the recruitment age of ordinary college graduates can be relaxed to 24.

Legal basis: provisions on political review of conscription

Article 8 Citizens under any of the following circumstances shall not be enlisted for active service:

(1) Spreading politically incorrect remarks, writing, editing, publishing and publishing articles and works with political errors;

(2) Having been subjected to criminal punishment, reeducation through labor, asylum education or administrative detention;

(3) Being under investigation for being suspected of violating discipline and law, or being investigated, prosecuted or tried;

(4) Being expelled from public office, ordered to resign, expelled from school, expelled from the Party, kept on probation, or expelled from the Party for serious mistakes;

(5) Tattoos showing signs of underworld organizations or criminal gangs, which are detrimental to the national image and social morality;

(6) Having close ties with people with complex political backgrounds at home and abroad and being politically suspicious;

(seven) participated in cult organizations or activities, participated in harmful martial arts organizations or actively participated in activities;

(eight) the main family members, immediate family members, members of major social relations or other relatives who have great influence on themselves are the backbone of cults or harmful martial arts organizations;

(nine) I or major family members, immediate family members to participate in ethnic separatism, violence, terror, religious extremism and other illegal organizations, criminal gangs or activities with the nature of the underworld;

(ten) the main social relations members or other relatives who have a great influence on me are the backbone of the above illegal organizations;

(eleven) the main family members, lineal relatives, members of major social relations or other relatives who have a great influence on me have been subjected to criminal punishment, expelled from the party, expelled from public office or have serious illegal problems that have not yet been ascertained, and I have sheltered or retaliated;

(twelve) the main family members have criminal acts that endanger national security or serious political problems, and I can't draw a clear line.