你需要俩人各自的出生公证书/医学出生公证书

大陆的出生公证书/医学出生公证书的官方要求见:

https://travel.state.gov/content/travel/en/us-visas/Visa-Reciprocity-and-Civil-Documents-by-Country/China.html

要有: 姓名, 性别, 出生日期, ID 号码, 出生地及父母姓名. 俩人有相同的父/母就可以. 所谓的"亲属公证"经常不被移民局认可. 你姐姐的那份很奇特, 还有你的美国护照号码.

Birth Certificates

Available

Fees: Varies. Normally RMB 200 - 300  (Notarization Fee: RMB 80 + Translation Fee: Non-standard)

Document Name: Notarial birth certificate (Chu Sheng Gong Zheng Shu)

Issuing Authority: Local Notary Public Office (Gong Zheng Chu)

Special Seal(s) / Color / Format: A notarized birth certificate normally contains a watermark, seal, and red stamp.  It must indicate the applicant’s name, gender, date of birth, ID number, place of birth, and both parents’ names.  All notarized documents must have an English translation, and be attached with a certificate stating that the English translation is in conformity with the Chinese original.

Issuing Authority Personnel Title: Notary Public (Gong Zheng Yuan)

Registration Criteria:

1. A National ID and household registration (Hu Kou Bu).  If the applicant lives abroad, a copy of his or her passport is also required. 
2. One of the following three documents:
    
   • Birth certificate (Chu Sheng Zheng Ming Shu) or medical certificate of birth (Chu Sheng Yi Xue Zheng Ming) issued by the hospital
   • Initial Birth Record issued by the Household Registration Department of the local Public Security Bureau
   • Proof of birth issued by the sub-district office or the Personnel Department of Work Unit
      
3. Photographs - at least two.
4. A signed affidavit or authorization certificate from the applicant if someone other than the applicant applies for the certificate on his or her behalf.  The authorized person also needs to provide his/her national ID.   
5. Documentation of both parents’ identification.  If deceased, a death certificate is required.   
6. Other documents requested by the Notary Public (Gong Zheng Yuan).

Procedure for Obtaining:

1. Complete an application and submit all relevant documents to the Notary Public Office (Gong Zheng Chu).
2. The Notary Public then examines the documents.  If the application is accepted, the applicant pays all related notary fees.
3. Once the review of the submitted documentation is completed, the notarial birth certificate is issued.

Certified Copies Available: Certified copies are not available.

Alternate Documents: There are no alternate documents.

Exceptions: None

Comments: Applicants should check the website or contact their local Notary Public Office to obtain specific information regarding required fees and supporting documents.