Family immigration for sibling

justaquestion

Registered Users (C)
#1
My wife is applying for immigrant visa for her sister. The application process says she need to submit her and her sister's birth certificate to prove that they are from same parent.

The problem is, my wife do not have a birth certificate. During our green card process, we used affidavit and certificate of non availability .

Can the same be used for the immigrant visa process ? Are there any other option ?
 
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