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I heard already muliple times, that there are ways to get dual citizenship.
What is the US law? Does the US allow dual citizenship?

Hi guys!
I have some questions regarding I-864.
My wife (I just got married last week ) will be my sponsor, but since she is a student and has no income her dad will be my joint sponsor. So both will fill out two separate I-864 forms.
Question 1:
For question 1 on the I-864 form does her dad have to mark “1d: I am the only joint sponsor? “
Does my wife have to mark “1a: I am the petitioner. I filed or am filing for the immigration of my relative?”
Question 2:
The household consists of 5 people: my wife, her dad, her mum, her sister and me.
What does my wifes dad have to check for question 21: “Your household size”?
I would guess:
“21a. Enter the number you entered on line 10.” – for me
“21b. Yourself”
“21c. If you are currently married, enter “1” for your spouse.”
What should he mark for his two daughters, both over 21 and one is my wife. Should he mark “21d: If you have dependent children, enter the number here”. I am not sure if this is just for children under 21 who are unmarried. He could also just mark Nr. 21e for his two daughters. “ 21e: If you have any other dependents, enter the number here.”
What does my wife has to fill out for this part???. She does not have any income, therefore she does not fill out any income tax return papers. She is not financially responsible for any of the persons living in the house, but listed as a dependent child on her dads tax income return.
Question 3:
As I mentioned the property guideline states that you have to have an income of $32,237 in a household of 5 people. My wifes dad had an income of: $39,861 in 2009, $50,434 in 2008 and $29,655 in 2007. So in 2007 he did not meet the guidelines requirements, what does this means? Do I have to find another joint sponsor?
I would appreciate it if someone could help me out.
Thanks
Adam