You do not file for your parents' visitor visas. You do not sponsor your parents unless they are required by the consulate to file an affidavit of support. Your parents apply for visitor visas based upon their desire/need to travel to the United States. Your parents will need to establish strong ties to India and convince the consular official that they will return after a brief trip to the United States. Whether the visa is issued will be at the discretion of the consular official. You can read more about nonimmigrant visas at http://myattorneyusa.com/travel-visas.
Answered on Mar 14th, 2016 at 4:58 AM