citizenship

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Can someone tell me something about citizenship in the United States? My son's best friend met a young lady a few years ago. She was from Norway and was here in Texas on a work visa. When her visa was just about up she found out she was pregnant but had to get back to Norway. My son's friend worked overtime, saved his money then went to Norway for the birth of his child. He stayed there, they got married and now have 3 beautiful children. They do come to Texas to visit every couple of years and his family goes to visit them. He is so wanting to move back home to Texas. What I am wanting to know is about citizenship, how does it work for his wife and their children? Maybe someone can teach me a thing or two. Thank you and have a great day.