两年前和妈妈一起来美，呆了5个月左右。这次单独去签。
签证官看了给他的信，然后问了两个问题：去美国看儿子？儿子在干什么？
就过了。其他材料都没看。
1. Primary materials
· Passport (护照)
· DS-156, DS-157 form (156和157表)
· Receipt of Visa Application Fee (申请费收据)
· Petition Letter to visa officer (给签证官的信)
· Invitation letter from inviter (Chinese) (邀请信)
2. Materials from applicants
· Certificate of relationship (亲属关系公证)
· Retirement pension certificate (退休证明)
· Pension stubs (退休金)
· Medical insurance card (公费医疗保险卡)
· Ownership certificate of house (房产证明)
· Proof of
