I am a legal alien in the US , and in September this year I have the option to obtain the US / dual citizenship . My sister and her 13 year old son would like to spend 1 to 1 1 / 2 years here in the US , they are German . From my research I see that the best and easiest option would be F1 visa , but she cannot change the status from visa waiver to F1 without leaving the US , correct ? Further , how long will it approx . take to get the F1 visa , and to enter the US ? Further , could she seek employment off campus ? Thank you very much in advance for your assistance !