Proof of citizenship for joint sponsor (different last name than on birth certificate

[Bilel 0]

Hello Guys, 20 days ago I got 221 from the Consular officer he requested a new joint sponsor, now I found a joint sponsor and I asked from her to prove her citizenship by sending me a copy of her birth certificate, When I looked to her last name on the I864 is different than the last name on the birth certificate, because she is divorced but chose to keep her ex husband name, how to prove citizenship to the embassy in this case? will a divorce and marriage certificate enough to show the name changed or she will have to add an explanation?

[NikLR 13,234]

does she have a current passport?

[Bilel 0]

does she have a current passport?

No she dosen't have a passport, only a birth certificate.

[NikLR 13,234]

Then a copy of the marriage certificate and/or should suffice if you're worried about the different name.