给岳母延长89天， 一定要老婆的出生证明？

. APPLICANT TO CALL IN PERSON
2. APPLICANT’S VALID TRAVEL DOCUMENT
3. APPLICANT’S DISEMBARKATION/EMBARKATION CARD
4. LOCAL SPONSOR’S IDENTITY CARD
5. ANY DOCUMENTARY PROOF THAT CERTIFY THE RELATIONSHIP BETWEEN LOCAL SPONSOR AND APPLICANT (E.G. BIRTH CERTIFICATES OR HOUSEHOLD REGISTRATION LIST)
6. Sponsor’s Marriage Certificate
7. LOCAL SPONSOR’S SPOUSE’S BIRTH CERTIFICATE

如题，第7条

不然？如果证明你媳妇是你岳母的闺女。。。