My parents came once, my mother-in-law came twice. My father-in-law came once. I haven't done this for any of their visa application.
This is what I read from the embassy's website about B2 visa:
http://www.usembassy-china.org.cn/visa/b1b2.html
Applicants for B-2 visas may wish to bring to their interviews letters of invitation from friends or relatives in the United States, information confirming participation in a tour group or conference, and documentation demonstrating the applicants ability and intention, or that of friends or relatives in the United States, to support his or her travel and other expenses. Documentation establishing the applicants personal status, such as marriage certificates, letters confirming employment, bank statements, pay slips, etc. is also useful.
This is what I read from the embassy's website about B2 visa:
http://www.usembassy-china.org.cn/visa/b1b2.html
Applicants for B-2 visas may wish to bring to their interviews letters of invitation from friends or relatives in the United States, information confirming participation in a tour group or conference, and documentation demonstrating the applicants ability and intention, or that of friends or relatives in the United States, to support his or her travel and other expenses. Documentation establishing the applicants personal status, such as marriage certificates, letters confirming employment, bank statements, pay slips, etc. is also useful.
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