Additionally, send a copy of your marriage invitation to show that he is only coming for a purpose. Ans: Here is a sample letter: Dear Rohan, I hope this letter finds you well.I am thrilled to share the joyous news that my brother is getting married! The purpose of the letter is to support the visa application for my brother Jose Gonzalez. In this blog, you will find samples of how to write a letter to your friend inviting him to attend the marriage ceremony of your brother. Unsure of the best wedding invitation wording? You are cordially invited to my brother's wedding. We look forward to celebrating with you. I hope this letter finds you in great spirits! Our brother's wedding would be pretty complete with your participation.