Birth date issue - Pls help!

[bonbonito]

I am a Green Card holder. My younger sister lives in India. I was born in Oct-1975 and she was born in Sep-1976. I used her real birth date (Sep-1976) at the time of my Green Card filing.

Now when I was starting to prepare for her tourist visa, I realized that her passport shows her birth date as Sep-1975. This happened because my father registered her age same as mine at the time of school admission so that we both could start schooling together. This used to be in practice back in 70s in villages in India as schools did not ask for any birth records and accepted whatever parents reported.

I am in a fix which date to mention in her tourist visa form. Technically, it should be the same as written on her passport. But then it won't match with my Green Card records with USCIS also it would show her 1 month older to me on papers.

If I give her real birth date, it does not match with her passport and she does not have her birth certificate.

How should we handle this situation? Please guide.

My birth date : Oct-1975
My sister's birth date : Sep-1975 (on her passport & all the certificates) and Sep-1976 (real and also mentioned in my GC records with USCIS)

[immihelp]

There is really no easy fix for this.