B-1 Visa

The process for filing a B2 extension for job searching after an H1B layoff is the same as the initial B2 application, using Form I-539. However, the supporting letter and evidence should detail your job search efforts, including companies contacted and resumes sent, and demonstrate sufficient financial resources to avoid unauthorized employment. While an attorney isn't strictly necessary for most cases, it can provide peace of mind, especially if you have the means. If you receive a Request for Evidence (RFE), you can always hire an attorney at that stage.

Yes, it may be possible for the mother to obtain a B-1/B-2 visa and potentially extend her stay in the US to help her children who are on H-1 visas. While not explicitly stated in law, there's a policy principle, often related to "cohabiting partners" as outlined in the State Department's Foreign Affairs Manual, that allows for B-1/B-2 visas in situations where close relationships exist, but dependents don't qualify for F-2 or H-4 status (like a parent of an H-1B holder).

This approach has been used successfully in the past for extended stays. However, it's not guaranteed and can be subject to the discretion of individual immigration officers. There's a risk of encountering issues or receiving requests for further evidence that may not make sense, requiring further action.

Yes, you can generally stay in the US while your B-2 extension or F-1 change of status application is pending, provided you file it before your current status expires. This applies to most applications filed while still in status (e.g., H-1, B-1, B-2, L-1, E-1, E-2). If your I-94 expires on April 21st and you apply for a B-2 extension or F-1 change of status before that date, you can stay in the US while your application is pending because you filed it timely.