Question reg. birth certificate for mother while sponsoring GC.

[znybrny]

Hello,

My sister is a citizen and is getting ready to file for my mother's immigration when she visit here on the visit visa.

In going through the checklists, i had some confusion so i'm asking more experienced readers to guide/clarify.

Is the birth certificate a must or will a non-availability affidavit do? She was born before 1970 so in such a case what are acceptable proven alternatives?

The non-availability affidavit will obviously be from india, is it acceptable?

I have been looking at the following 2 places.

http://www.uscis.gov.../i-485instr.pdf

http://www.*******************

Thanking everybody in advance for taking the time to read and respond.

[Attorney_11]

_{Consult the US Department of State visa reciprocity page, which can be googled from the internet. A birth certificate is a must. If it is not available, a non-availability certificate and secondary evidence such as affidavits from individuals with personal knowledge of the applicant's birth and other contemporaneous evidence of birth date, alienage and parentage must be submitted.}