The main family members have committed crimes endangering national security or serious political problems, and I can't draw a clear line and are not allowed to join the army.
Extended data:
"Regulations on Conscription Work" Article 20 The political review of citizens eligible for enlistment shall be organized by the county and city conscription offices in a unified way, and the public security organs shall be specifically responsible for it, and the relevant units shall provide assistance.
Article 21 State organs, public organizations, enterprises and institutions, villagers' (residents') committees, people's governments of townships, nationality townships and towns, neighborhood offices and police stations shall, in accordance with the relevant provisions of the political review of conscription, and in accordance with the arrangements and requirements of the county and city conscription offices, seriously conduct political review of citizens who have undergone physical examination, focusing on finding out their actual performance.
Genhe city Municipal Government-Provisions on Political Examination of Citizens Recruited "Provisions on Political Examination of Conscription"