Get the visa for a child if parents are with student X in china

The child can apply for S type. First, provide passport, a passport-style photo, a completed application form, an invitation letter from the parent and copy of the inviter's residence permit, as well as the birth certificate. Next, submit the application to the Chinese embassy.

Thank you very much to your reply.

my husband has student X and he is in china. my son and i would like to apply for S1. is it ok to apply for S1s

It will be okay.

What is the "inviter's residence permit "

The Invitation letter of Duly Authorized Unit or a Confirmation letter of Invitation refers to a letter issued by related Chinese government departments, companies or social organizations which was authorized by the Chinese Foreign Ministry. You can find an agency to help you apply it.