-Right, but he needs to write statement explaining why he joined the Party.
另外12年前申请时他们的儿子还没有出生,他能一起签过来吗?
-Yes. Send a letter to USCIS now to inform them about the child (include the copy of the child birth certificate), and ask them to add the child into the derivative list. Also, do the same way to NVC to ask them to add the child into the process.
什么时候提供他的信息?
-Do it now because NVC has asked you to provide the required documents.