Hi, Thanks for your question.If you intend for your parents to come to this country to remain here until they pass away then it is probably best for you to apply on their behalf for settlement in this Country. You will need to apply using Form SET(F), available for download here:-http://www.ukba.homeoffice.gov.uk/settlement/applicationtypes/
There are also some guidance notes on the site that will help you. You parents must be over 65 years of age (which they are obviously) and there must be exceptional circumstances which means that they need to come here. They will have to show that they depend wholly or mainly on you for money, that you and your parents can and will be housed and maintained adequately without needing public funds in accommodation that you either own or exclusively occupy and that they have no other close relatives in the US who can support them financially. Rightly or wrongly, it's one of the more difficult immigration statuses to prove and it will almost certainly go to appeal. It would be best for a solicitor/immigration practitioner to prepare, or at least check, the application before it is made.If this is useful please kindly click accept so that I may be rewarded for my time. It will be gratefully received and you will be free to ask follow up questions.
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