Good question , No body has answer including Service center
However this may be eyeopener for others if allready does not have Affedivat's.
Typical RFE you can expect if Unlucky ppl having Indian Birth Certificates
1) If you are born earlier to 1970
2) If you obtained birth certificate recently
3) Look for registration date on Birth certificate for those registred very late.
This should match very close to your birth date
4) If Both parents name are not in the Birth certificates.
Possible resolution
Obtain an Affedivate from place of your country where parents are living
A) school certificates inidcating your DOB and both parents name on certificate
B) Hospital certificates inidicating your DOB and both parents name on the certificate.
C) obtain Court Affedivate form both parents living
use proper court language and intent is to prove that parents name and child DOB are on same document.
i (Father) born on date at place,state,country living at addr
i (mother born on date at place,state,country livnig at addr
We married on so and so date at so and so place,state,country
we did not regester our son/daughter (your name) born on so and so date at address .
We are the parents of your name born on date and at address.
if parents NOT living obtain similar affedivate from a relative who is elder to you and intent should be to prove that he is related.
i (relative name) born on date at, place, state, country, living at addr.
Establish relation (brother,sister,uncle,etc) to parents name
i know <your name> born on at place,state,coutnry,
i know parents name 1, name 2 are parents of youir name
I will let your know what exact affidivate i am providing