like most other US citizens, I don't have the slightest idea of how a US Visa works and what the procedures are for non-citizens at US Port of Entries. My question center around this situation I have coming up in 5 weeks:

My 80 year old grandmother from China managed to obtain a US Visa and will be traveling with my Dad (a UA 1K) in late August on UA Flight 888 PEK-SFO. They'll be traveling in Business Class on the upper deck of the 747 (first plane ride for her and she'll be in the upper deck of the 747, stairs are no issue for her).

I read up a bit on the US Embassy website that a US Visa is valid ONLY for travel to the US Port of Entry (in this case, SFO), and she'll have to petition for entrance there at immigration. What are the chances the officer would turn her back? Since she's on a non-immigrant visa, is she only entitled to one entry into the USA? I so far only have booked her a one way award ticket as I have no clue as to how long she'll be allowed to stay (we're hoping for 6 months).

Another question, since she doesn't speak any english and also doesn't read chinese at all, she'd have to follow my dad closely. My dad is a US Citizen though, so should they both stand at the non-citizen line or is she entitled to go with him into the citizen line?

Thanks for any advice.