David and Ariana

Yes, bought tickets for my wife to fly on Monday - very expensive on such short notice! Feeling lucky, bought the ticket for our son to come home as well. She has birth certificates, residence certificates and photos from baby to now, so I don't think there will be a problem. If there is a problem, it will be the short time line and the Chinese mail system. Its difficult to find an address for them to send the packet to that receives postal mail. Having to send it to the work place of her uncle.
In answer to Darnells question, I did use the web portal to send the same message that I sent the email and yes, it doesn't allow attachments. Turns out it was the email that got action. What actually happened was I sent the email to the contact email of the US CIS office there. They replied back - "we don't deal with immigration - send it to the immigration office using the web portal". However, I think they must have forwarded it to the right office anyway, as when I got the good news back, it was a reply to that email. I also sent two faxes, so perhaps that got someones attention.
I was so expecting the emails and faxes to not accomplish anything, as I expected that the proper process had to be followed - it must be submitted by mail. But I guess they are more flexible than I thought. In fact, at least for me, in this whole process from my wifes K1 to her green card and now, I have been continually suprised by how "human" and helpful the immigration service people that I have dealt with have been, from the jolly woman who easily gave my wife the K-1 (thought what she said made it easy was my 1 page, bulleted, succinct description of our timeline and relationship), to the officer in San Francisco who jumped through loops to get my wife a temporary green card because she had a trip planned immediately after the interview, to this quick response. I know it isn't everyone's experience, but I've learned that behind all the regulations and forms, there still are good people.

Wonder of wonders. Composed an email describing the chronology and asking that the case be reopened and a new interview scheduled and included scans of our DS-230 and the Letter that came with the packet last year, both listing my step-son as a follow-on. Next morning had a response saying I had sent it to the wrong people (CIS) and to use the web portal to submit the request, which I did. Prepared a larger packet including the OF-169 and other documents, faxed it and tried to get it to a friend in China, but had repeated problems with scanning while trying to do my day job, so we hadn't gotten it off by the time I came home from work last night. An hour after I came home from work - there was an email reply to my original email, re-openning the case and granting us an interview on June 27th! Only took 24 hours!
Thanks for all your help - you have saved our family much heartache!