How to get a US visa is you're an uncle and bringing your niece?

Question

My father wants to help my cousin come to the US from El Salvador but we need information about it. She isn't under age and we are citizens, so we think that might help, but we need more information if we can do that...Help?

Answer 1

Not possible. Your father could sponsor his brother/sister the parent of your cousin, which takes between 10 and 20 years, then that parent could sponsor your niece, if she stays single, which would take several more years.

Answer 2

Mark is right.  Your father cannot petition for a niece or nephew.