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请教8老师， 在父母绿卡申请中， 如何证明以下关系：

1  Evidence that an emotional or financial bond existed between you and your father before you were married or reached the age of 21. 
-If you were born after your parents got married, you don't need to do this.

 2，关于 complete form I-864 affidavit of support by sponsor (you) for your parents .  是否可以由 petitioner  以外的相关人士提供？ 担心petitioner 的目前家庭收入不够支持父母移民后的所有生活费用 （对此，USCIS是否对petitioner有明确的资产下限要求？）。 
-Yes if that person is willing to be the joint sponsor. As a joint sponsor this person has to file another I-864 together with your I-864 and he/she has to be a green card holder or US citizen.

 3 父母本人在国内的财产是否可以用于计算在移民后的资金支持？
-Not at all!

 他们的国内财产证明是否需要公证， 如果不需要公证，以何种文件形式提交给移民局？