Dear All, I need to file for the extension of the visa (B2) for my parents for their continuing medical treatment, and I would like to know about the application fee. One website says that it costs $300.00 for filing for the extension, and this costs includes the spouse and children, if any.  Do  I need to pay $300 ""for each parent"" or this cost is sufficient for both of them once we include the either father or the mother under one of their names? Does anyone have any experience or knowledge about this? I thank you so much in advance. Sakuntala