Hi Community -
Hope all is well.
Here is a situation. I am a USC. I have a sister (>21 yo). I understand that I can sponsor her by filing I-130 under the F4 category, which is currently at ~18 years wait time. Another way - could be sponsoring my mom first and then my mom can sponsor sister (her daughter) under F2B category which is currently at 8 years wait time. But my sister is married. Does this disqualify her from the F2B category? What if she divorces - will she qualify for F2B then, and will F2B provide her < 21-year-old children with a green card as well? For my mom (once she gets a green card) to sponsor her daughter - does mom have to be in the US for the entire time of her daughter's green card process?
Is my math fair below for each scenario for SISTER?:
F4: 18 years to wait for the visa to become available + ~1.5 years to get consular processing/come to the US. All in ~20 years.
F2B: 2 years to get a green card for mom + 8 years for immigrant visa to become available for sister + ~1.5 years to get consular processing/come to the US. All in ~12 years.
I hope for detailed advice. Thank you.