请问
我姨妈给我母亲十几年前申请了亲属移民但是一直没排上，现在我可以给我母亲申请移民吗？-Yes if you are a US citizedn. 没有什么影响吧？-Not affect anything.
父母离异，给他们申请绿卡的时候需要结婚证离婚证都递交吗？-Yes.
境内申请绿卡也需要提交无犯罪记录公证吗？-Not need it if they file I-485 in US.
父母有了绿卡后可以立即回国吗？-Yes, but had better not stay outside US for > 6 months. 如果不急着入籍，最多在境外不能超过多久？-If they are not used to living in US permanently, they had better not get the green card. I have seen many Chinese's parents abandoned their green card because they were not used to living in US.
有绿卡父母，但没有美国收入，必须报税和有医疗保险吗？-If their income is lower than the threshold for IRS tax filing, they don't need to file the tax return, but they had better have health insurance.
不好意思给您这么多问题，非常非常感谢！
