回複：If I start to apply for US citizenship now, how long does it

If I start to apply for US citizenship now, how long does it take to get it?
-Several months to one year, case by case. 

After I get citizenship, can I apply for green card for my father immediately?
-Yes. 

How long does it take my father to get his green card?
-If he is in US, it may take several months to one year. If he is in China, it may take one to two years.

Sorry for these low level questions.