RFE for initial evidence - I130

[sabita12]

For my mother's gc application, I had submitted my NAC from my own gc application (25 years ago - NAC did not have the letterhead paper at the time) and an affidavit from my parents for my birth (also from my own gc application). I received a RFE (it says submit a copy of the birth certificate issued by the appropriate civil authority for the petitioner listed on Form I-130) asking for a birth certificate and says in the absence can provide NAC and secondary evidence.  It does not state DNA test.

I understand now that affidavit from my mother (beneficiary) is not good enough.  I also wonder if they did not like the NAC from 25 years ago which does not have letterhead paper, or a proper seal of commissioner who signed the NAC.

I have now got

1) a letter from my school principal (where I studied from grade 3 to 10) with my date of birth and parent's names as per school records (as my transcript only has Date of birth),

2) affidavit from an aunt and cousin. 

3) I am also awaiting a new NAC (pending lockdown open) with letterhead paper and a stamp of commissioner . 

4) For what it's worth, I also have a NAC from consulate explaining that prior to 1969 registration is not mandatory. 

I hope that with the new NAC and the school letter, and affidavits from 2 relatives, it will be satisfactory.    Do you think this will make the case for my relationship to my mother, the beneficiary?

Should I pre-emptively do the DNA test even though my RFE for initial evidence document does not list it?

Appreciate any advice.