Should we move to the USA?

I think Bossyrossy is right. Test the water first, rent and plan to stay there for a few months to see how it goes and what the real implications of life there will be. Good luck. That way you always have the option of coming home to the UK.

I doubt very much that the OP is reading these comments as the first ( and only) comment from her was on the 5th of February.

Why do people do that MerylStreep ask a question and for opinions then disappear.
It would be interesting to know what decision the OP came to.

Mamguliz I don't know if the US is as strict as Canada regarding immigration, but I would imagine it is probably more strict.

My friend - a homeowner - emigrated to Canada ten years ago when she was about 78 to be near one son living there and one son living in the US (both are chartered accountants so have good salaries). It took her about three years to jump through all the hoops for permission to live there, and she had to provide a great deal of information as to how much capital and income she had. I believe her sons also had to act as guarantors should she run out of money.

I can understand why you would want to move to be near your son and grandchildren and I suppose if it were me I would feel similarly drawn. The US would not be a country I would ideally choose because of its awful health system and gun culture but I can certainly understand the pull of wanting to be near your family.

I think the idea of visiting for several months of the year is quite a good one but I suppose you have to bear in mind that you might not always be able to do that. It is said that travel insurance is going to be very much more expensive from now on.

I wish you good luck and happiness, whatever you decide.