What are the requirements to accompany US citizen go back to USA?

He cannot travel alone because he's suffering from illness. He will continue his medications in USA.

Answer:
We need more information. If he is going to the US temporarily and keeping his permanent residence abroad (and never mind the question of the chance that he could die while in the US of his illness) he is entitled to bring a medical or personal attendant with him for a specific period of, say, a year or less; or sometimes even longer.

If he is moving permanently abroad, he probably cannot take a foreign personal attendant who intends to stay in the USA rather than just accompany him and then leave to return home.
no idea
Just have valid American passport and prescription for meds, if he has to take then on flight,
Go to www.uscis.gov
why dont you call or log onto the IMMIGRATION, oops HOMELAND security website & find out or hey this person cant come back....ROFL

The immigration information post by website user , MyTend.com not guarantee correctness

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