Green Card through Parent or Child FAQs

See clip from Attorney Rajiv S. Khanna's conference call video that addresses this question. 

This is another very commonly encountered problem. Where somebody’s here on an H visa, L visa or Green Card and their parents are in India, Pakistan , UK or somewhere else and the child is the only support for the parents and  the parents are not eligible for any visa to come to the US . We had actually on immigration.com in our sample cases (http://www.immigration.com/sample-cases) there is some mention on cases like this we have done. It doesn’t mean that they will always be successful but really the law permits for a tourist visa and then continued extension of a tourist visa. Sometimes the USCIS and the State Department might  consider it to be an acceptable reason for a parent to live in USA on an extended basis. So if your brother has tried to go to the UK and they have not been able to procure a visa to the UK and you are in USA and you being a  Green Card holder of course cannot apply for them until you become a US Citizen.  I think it would be a good idea to apply for a tourist visa.  Make it clear that they want to come and stay here long term as far as the law allows them to.

Once again it will be a good idea to try that. I am not sure if it will work but it is worth trying.  Does the law permit a B-1 and B-2 in these circumstances the answer is “yes”. You can actually disclose to the consulate that your parents are going to USA and intend to stay there as long as the law permits because the son resides in UK.

Contact USCIS customer service or a lawyer. This is what they say: Whether someone born outside the United States to a U.S. citizen parent or parents is a U.S. citizen depends on the law in effect when the person was born.
These laws have changed over the years, but usually require a combination of at least one parent being a U.S. citizen when the child was born and having lived in the U.S. or its possessions for a period of time. Additionally, children born outside the United States may become citizens after birth based on their parent’s citizenship or naturalization.

A timely filed I-485 gives your parents the right to stay (referred to as "authorized period of stay") in USA pending adjudication (without having to extend their B status).

USCIS does have the right to insist that you produce the original. They may give you time to get it if you do not have it. It is best to start the process of getting it right now.

No, I cannot think of any such possibility.

You will need to file 130 and adjustment of status papers together.