The 601 Waiver waives the Grounds of Inadmissibility, while the 601A Waiver is a Provisional Unlawful Presence Waiver. There are some differences between the two waivers. However, for both waivers, you must prove that the qualifying relative, such as a U.S. Citizen or Green Card holder spouse, parent, or child, of the Applicant would suffer extreme hardship if the Applicant were forced to return to their home country, could not be in the U.S., and/or if the qualifying relative moved to the home country of the Applicant to avoid separation.