After 10 years in the US and 5 as a green card holder, my mother and I are up for citizenship ceremony on July 27th, 2011. It was a long process but we're being sworn in on the same day in NYC. Now, my father has been in the US for about 20 years and his visa has been expired for about 15 of those 20 years. He has owned businesses, paid taxes, etc but does not hold a valid SS#, Green Card, Work Permit.. Anything. Now, as soon as I become a citizen, I would like to apply for his card as he is immediate family. Is there any way for me to find out how much his overstay fees will be? Would he need to leave the country and then come back seeing that his overstay is over 10 years [read somewhere that 10 years makes you auto ineligible]? What documents would I file besides affidavit of support/ medical paperwork? Thanks in advance.