您好，我有两个问题：
1. 父母在国内，72-73岁。请问这个年纪从国内帮他们申请绿卡还容易吗？因为他们暂时无法来美。
-Yes, but if they apply for the immigrant visa in Guangzhou, China, it may be not convenient for them to go and back unless they live near Gunagzhou such Human, Fujin, or Guangxi province, etc.
2. 如果可以在国内递交130，当130批准之后，是否有可能让他们持已有的B2签证入境美国，在美国继续申请485？我知道B2是非移民签证，跟130有冲突，但听别人说这样做过，请问是否需要准备额外的材料，写信说明，帮助过海关？
-They had better enter US using the B2 visa. Then, you can file I-130 and they file I-485 concurrently after 90 days from the day they arrive in US using B2 visa. Don't file I-130 before they come to US.
