Thanks Dev, could you please clarify the following info?

How does 3+ affidavit help us get the marriage or death certificate?

Are you saying that 3 people who know me or the event write an affidavit on a legal document and sign and we give the signed document to the concerned authority and the concerned authority will give us the certificate?

Is this doable from USA or does it require us to travel to Nepal ? If so where do we submit the affidavit to get the marriage and or death certificate?
what do you mean by 2+ person affiliated ?
does dna stand for DNA test (deoxyribonucleic test)?

Please help me understand this. Thank you this is very hepful.