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请教8老师：

我给父母申请延期（I－593）， 是不是总共只用交一张表？（他俩都是B－2）
-Yes, but they need to provide the copy of their marriage certificate to prove they are in the same family.

我总共交多少申请费和biometric费呢？是370+85， 还是370+85*2？
-Only one check of $370, not biometrics fee (not need to do fingerprinting for B-2 extension)

父母在申请绿卡上犹豫不定，所以先申请延期，那么这个延期会不会对将来申请绿卡有不利影响？

谢谢8老师的辛勤指导！