母亲在中国，我正在填写DS260 （等8老师回复时问到了1-2的答案，贴出来供其他人参考）
1 DS260上让填写绿卡邮寄的美国地址（我的居住地址），请问绿卡是邮寄到哪里？
-Your address.
如果邮寄给我，母亲来美入关时怎么办？-She will use the immigrant visa (stamp) to enter US.
（绿卡是在父母登陆美国后寄到美国住址）
2 DS260上问申请社安号，填Yes还是No。如果填Yes，母亲到美国后，还能再申请社安号吗？（填Yes, 这个还需要去社安局办还是会自动寄来就不知道了）-If you fill yes, then the SSN card will be mailed to you, and she does not need to go to teh local SSA office to apply for it. If you fill no, then she needs to go to the locall SSA to apply for it.
3 我父亲去世，civil document要求提供Marriage Terminate Certificate，这个是去公证处办吗？要带什么证明呢？父母结婚证找不到了。（公证处回复没有Marriage Terminate Certificate, 分析是否是父亲去世公证。仅办去世公证可以吗）-Not need to provide such a document, and just fill "Deceased" in the related item on DS 260 (if asked there).
