If you have cancer (surgery), is it possible to get high marks when you visit relatives in the United States (if the answer is really useful, you will get extra points)

Getting a visa in China mainly depends on whether there is a tendency to emigrate, and the success rate is about 50%. The number of recent family visits, real estate and so on are all factors to consider.

Getting a green card is mainly "paying taxes". When you buy a car or a house, you can basically get a green card as soon as you pay the tax bill.

As for parents, the United States only supports immediate family members, so your mother's sister is probably of little help to this =-=

If you get a green card, your parents will have hope, or if you have money and skills, you can also be a capital immigrant or a skilled immigrant. As long as you can prove that you can support yourself after immigration and will not become a burden to society, the United States still supports such immigrants.