回复：母亲green card 申请 RFE, please help.

we run into the same problem. I got RFE yesterday. family household registry is 户口本.  I don't think they care about your parents birth cert. They want to make sure you are qulified to file I-130 for them.

Are your field office in SF? It looks like there is a policy shift. It is rarely a problem a few years ago and it totally caught me off the guard.
Send me pm if you want to discuss it

good luck!