How to write a letter inviting my brother who lives in Haiti to attend my wedding in the 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. We are honoured to invite you to our brother's (name) wedding ceremony on (date). Learn how to create an invitation letter for a visa application with tips, format guidance, and examples to make the process easier. This post contains a guide to writing your own Invitation Letter for Immigration and a sample Affidavit of Support and Guarantee for visiting relatives. Invite your relatives to your brother's wedding with these heartfelt messages. You are warmly invited to celebrate my brother's wedding with us. Invite your relatives to your brother's wedding with these heartfelt messages. You are warmly invited to celebrate my brother's wedding with us.