Question on I-130 - do we need to include beneficiary's birth certificate?

Triple,
AFAIK, beneficiary's BC is not required for I-130, and nowhere in the process they will require the original BC. However, once the I-130 process is done, they will need beneficiary's BC for CP or AOS.
 
So no evidence required with the I-130 application then how will you proof the common parents (If you are filling for siblings) -- May be i am missing some thing here?
 
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