Am happy to share the info that my in-laws got visitor visa in US consulate in chennai.
They had an appointment saturday, Nov 18th in Chennai (special tamil appointment).
We took the help of http://www.visaways.com in preparing all the documents and scheduling up the interview for them.
They asked couple of questions regarding my job and the childrens they have. The VO was satisfied with the answers they had given and atlast said we are granting you visa for 10 years and Happy journey.
Hence it was an happy ending and big relief for all of us.