Parents bring niece here for summer vacation, how to apply?

My parents will bring my sister's daughter (16-year-old) here for vacation.
Could they get B2 visa?
Any documents should they prepare especially for my niece?
Thanks for any answers.

所有跟帖： 

• B2 visa, as usual. -863211- ♂ (0 bytes) () 04/19/2010 postreply 19:04:58

• Thanks a lot. How to prove the relationship? -please_help!!!!- ♂ (0 bytes) () 04/20/2010 postreply 11:25:26