Make sure the visitor's name is in the culturally correct format. State the dates for the visit.Please fill out the following form in its entirety. We will review your request and follow up with you as soon as possible. An invitation letter for the sake of a B2 visa is not required. No invitations, no sponsorships - in fact no documentation is required. It sounds like you sent an invitation for your brother and his family to visit you in Minnesota, and they got approved for a B2 visa. I send a letter invitation to my brother and his family to come and visit me in minnesota they applied for b2 visa. At the same time, we expect you, the visa applicant, to: Plan your travel and visa application as far in advance as possible. Present you visa letter of invitation to the Consular Officer during the visa interview.