That depends on their visa.
A valid US passport and a plane ticket
a resident?
A resident alien?
i am a us citizen i have been marry to Persian lady so how long it take for her to get citizen through marriage.
It makes no difference how long a US citizen of ANY age is out of the country. "Once a US Citizen, always a US Citizen." -UNLESS- you renounce your US citizenship and become a citizen of another country. However, since the question is about a 'minor' child that eventuality should not arise.
18yrs
You have to be a natural-born US citizen, so your entire life.
To become a representative you must be a citizen of the US for seven years.
No, she is not. She is Pakistani, although she lives in England now.
18yrs
Passport and airline ticket that's it. Before you land British authorities will have you fill out a form asking you how long you will be in the country, where you are going, and why you are there. It is pretty simple to do.
by legally marrying that us citizen or print a form from the internet requesting to be a permanent resident