I got my parents Visitor Visa stamped when I worked for Company A . But now I work for company B and I am planning to get them to US now. Do they need to go for stamping again?
I see no need for a new visa.
I am a US citizen can I apply for green card for her while she is in US and can she stay here while the application is in process?
The answer to both your questions is - yes. But you MUST speak with a lawyer to understand all the nuances of her case.
Can a friend co-sign for me to bring my brother to the United States, I have green card and i don't make enough money. I just want to know if a friend can co-sign for me.
An affidavit of support can be co-sponsored by your friend. But green card holders cannot sponsor siblings for green cards, only US Citizens can.
FAQ: Entering the U.S. on a visitor visa while green card is pending |Qualifying for Visa Waiver Program (VWP) | Spouse visa through H-1, L-1, or O-1 | Any special visas for UK, EU, Singapore, Dubai or Australia || Qualifying for EB-1C green card by working abroad for a year | Expected processing times for EB-1C for an L-1A visa holder from India || Consequences of employer withdrawing I-485 Supplement J || Layoff while on an H-1B visa - what if I cannot find a job in 60 days?