How to write a letter inviting my brother who lives in Haiti to attend my wedding in the US? I would like to invite you to the United States of America to stay with us for three months.It would be very nice to have you with us. To help you extend invitations, we have samples on how to write a letter to your friend to invite to your brother's wedding for you. Use an appropriate tone. Although not a requirement, your U.S. host can write a letter. We've provided a sample invitation letter for a B-2 visitor visa. Unsure of the best wedding invitation wording? The letter should include specific details like your relationship with the visitor, the purpose of their visit, duration of stay, and financial arrangements. We (the groom's family) are happy to invite you to our holy solemnisation.